15728745730 has 32 divisors (see below), whose sum is σ = 29958812928. Its totient is φ = 5933188800.

The previous prime is 15728745709. The next prime is 15728745829. The reversal of 15728745730 is 3754782751.

It is a happy 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, 465261 + ... + 497920.

It is an arithmetic number, because the mean of its divisors is an integer number (936212904).

Almost surely, 2^15728745730 is an apocalyptic number.

15728745730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15728745730 is a deficient number, since it is larger than the sum of its proper divisors (14230067198).

15728745730 is a wasteful number, since it uses less digits than its factorization.

15728745730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963282.

The product of its (nonzero) digits is 1646400, while the sum is 49.

The spelling of 15728745730 in words is "fifteen billion, seven hundred twenty-eight million, seven hundred forty-five thousand, seven hundred thirty".