87320725 has 6 divisors (see below), whose sum is σ = 108277730. Its totient is φ = 69856560.

The previous prime is 87320669. The next prime is 87320729. The reversal of 87320725 is 52702378.

It can be written as a sum of positive squares in 3 ways, for example, as 18861649 + 68459076 = 4343^2 + 8274^2 .

It is a de Polignac number, because none of the positive numbers 2^k-87320725 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87320729) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1746390 + ... + 1746439.

Almost surely, 2^87320725 is an apocalyptic number.

It is an amenable number.

87320725 is a deficient number, since it is larger than the sum of its proper divisors (20957005).

87320725 is a wasteful number, since it uses less digits than its factorization.

87320725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3492839 (or 3492834 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 87320725 is about 9344.5559017002. Note that the first 3 decimals coincide. The cubic root of 87320725 is about 443.6485954894.

The spelling of 87320725 in words is "eighty-seven million, three hundred twenty thousand, seven hundred twenty-five".