1621102704 has 80 divisors (see below), whose sum is σ = 4520460672. Its totient is φ = 497643264.

The previous prime is 1621102699. The next prime is 1621102723. The reversal of 1621102704 is 4072011261.

It is a super-2 number, since 2×1621102704² = 5255947953832223232, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 288627 + ... + 294189.

Almost surely, 2^1621102704 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 1621102704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2260230336).

1621102704 is an abundant number, since it is smaller than the sum of its proper divisors (2899357968).

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

1621102704 is a wasteful number, since it uses less digits than its factorization.

1621102704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6054 (or 6048 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 1621102704 is about 40262.9197152914. The cubic root of 1621102704 is about 1174.7267097019.

Adding to 1621102704 its reverse (4072011261), we get a palindrome (5693113965).

The spelling of 1621102704 in words is "one billion, six hundred twenty-one million, one hundred two thousand, seven hundred four".