15720725 has 12 divisors (see below), whose sum is σ = 19552320. Its totient is φ = 12538800.

The previous prime is 15720721. The next prime is 15720779. The reversal of 15720725 is 52702751.

It is not a de Polignac number, because 15720725 - 2² = 15720721 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15720721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10046 + ... + 11504.

It is an arithmetic number, because the mean of its divisors is an integer number (1629360).

Almost surely, 2^15720725 is an apocalyptic number.

It is an amenable number.

15720725 is a deficient number, since it is larger than the sum of its proper divisors (3831595).

15720725 is a wasteful number, since it uses less digits than its factorization.

15720725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1900 (or 1895 counting only the distinct ones).

The product of its (nonzero) digits is 4900, while the sum is 29.

The square root of 15720725 is about 3964.9369477963. The cubic root of 15720725 is about 250.5094942902.

The spelling of 15720725 in words is "fifteen million, seven hundred twenty thousand, seven hundred twenty-five".