1620524664 has 128 divisors (see below), whose sum is σ = 4978483200. Its totient is φ = 484289280.

The previous prime is 1620524663. The next prime is 1620524671. The reversal of 1620524664 is 4664250261.

1620524664 is a `hidden beast` number, since 1 + 620 + 5 + 24 + 6 + 6 + 4 = 666.

1620524664 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1620524664² = 5252200373264625792, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620524663) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 168777 + ... + 178119.

It is an arithmetic number, because the mean of its divisors is an integer number (38894400).

Almost surely, 2^1620524664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1620524664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2489241600).

1620524664 is an abundant number, since it is smaller than the sum of its proper divisors (3357958536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1620524664 is a wasteful number, since it uses less digits than its factorization.

1620524664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9442 (or 9432 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 1620524664 is about 40255.7407583068. The cubic root of 1620524664 is about 1174.5870681788.

The spelling of 1620524664 in words is "one billion, six hundred twenty million, five hundred twenty-four thousand, six hundred sixty-four".