15613725 has 24 divisors (see below), whose sum is σ = 27175840. Its totient is φ = 7888320.

The previous prime is 15613709. The next prime is 15613727. The reversal of 15613725 is 52731651.

It is not a de Polignac number, because 15613725 - 2⁴ = 15613709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15613692 and 15613701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15613727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4054 + ... + 6903.

Almost surely, 2^15613725 is an apocalyptic number.

15613725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15613725 is a deficient number, since it is larger than the sum of its proper divisors (11562115).

15613725 is a wasteful number, since it uses less digits than its factorization.

15613725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10989 (or 10984 counting only the distinct ones).

The product of its digits is 6300, while the sum is 30.

The square root of 15613725 is about 3951.4206306087. The cubic root of 15613725 is about 249.9398521968.

The spelling of 15613725 in words is "fifteen million, six hundred thirteen thousand, seven hundred twenty-five".