1620517104 has 100 divisors (see below), whose sum is σ = 4724999664. Its totient is φ = 536170752.

The previous prime is 1620517103. The next prime is 1620517127. The reversal of 1620517104 is 4017150261.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620517103) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 172989 + ... + 182115.

Almost surely, 2^1620517104 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 1620517104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2362499832).

1620517104 is an abundant number, since it is smaller than the sum of its proper divisors (3104482560).

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

1620517104 is a wasteful number, since it uses less digits than its factorization.

1620517104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9284 (or 9269 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 1620517104 is about 40255.6468585464. The cubic root of 1620517104 is about 1174.5852416321.

Adding to 1620517104 its reverse (4017150261), we get a palindrome (5637667365).

The spelling of 1620517104 in words is "one billion, six hundred twenty million, five hundred seventeen thousand, one hundred four".