15715728730 has 32 divisors (see below), whose sum is σ = 30488079888. Its totient is φ = 5798208000.

The previous prime is 15715728713. The next prime is 15715728757. The reversal of 15715728730 is 3782751751.

It can be written as a sum of positive squares in 8 ways, for example, as 787531969 + 14928196761 = 28063^2 + 122181^2 .

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, 122670 + ... + 215590.

Almost surely, 2^15715728730 is an apocalyptic number.

15715728730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15715728730 is a deficient number, since it is larger than the sum of its proper divisors (14772351158).

15715728730 is a wasteful number, since it uses less digits than its factorization.

15715728730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94242.

The product of its (nonzero) digits is 411600, while the sum is 46.

The spelling of 15715728730 in words is "fifteen billion, seven hundred fifteen million, seven hundred twenty-eight thousand, seven hundred thirty".