1620943164 has 96 divisors (see below), whose sum is σ = 4290764800. Its totient is φ = 535692528.

The previous prime is 1620943141. The next prime is 1620943169. The reversal of 1620943164 is 4613490261.

1620943164 is a `hidden beast` number, since 16 + 209 + 431 + 6 + 4 = 666.

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 (1620943169) 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, 1110267 + ... + 1111725.

Almost surely, 2^1620943164 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 1620943164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2145382400).

1620943164 is an abundant number, since it is smaller than the sum of its proper divisors (2669821636).

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

1620943164 is a wasteful number, since it uses less digits than its factorization.

1620943164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1611 (or 1591 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 1620943164 is about 40260.9384391373. The cubic root of 1620943164 is about 1174.6881717267.

It can be divided in two parts, 1620 and 943164, that added together give a square (944784 = 972²).

The spelling of 1620943164 in words is "one billion, six hundred twenty million, nine hundred forty-three thousand, one hundred sixty-four".