15730820644 has 36 divisors (see below), whose sum is σ = 34934684400. Its totient is φ = 6128890320.

The previous prime is 15730820621. The next prime is 15730820657. The reversal of 15730820644 is 44602803751.

It is a junction number, because it is equal to n+sod(n) for n = 15730820597 and 15730820606.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3645994 + ... + 3650305.

It is an arithmetic number, because the mean of its divisors is an integer number (970407900).

Almost surely, 2^15730820644 is an apocalyptic number.

15730820644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

15730820644 is an abundant number, since it is smaller than the sum of its proper divisors (19203863756).

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

15730820644 is a wasteful number, since it uses less digits than its factorization.

15730820644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7296328 (or 7296319 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 40.

The spelling of 15730820644 in words is "fifteen billion, seven hundred thirty million, eight hundred twenty thousand, six hundred forty-four".