87731478025 has 9 divisors (see below), whose sum is σ = 108788869191. Its totient is φ = 70183997640.

The previous prime is 87731478017. The next prime is 87731478053. The reversal of 87731478025 is 52087413778.

The square root of 87731478025 is 296195.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 31583332089 + 56148145936 = 177717^2 + 236956^2 .

It is not a de Polignac number, because 87731478025 - 2³ = 87731478017 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1451356 + ... + 1510594.

Almost surely, 2^87731478025 is an apocalyptic number.

87731478025 is the 296195-th square number.

87731478025 is the 148098-th centered octagonal number.

It is an amenable number.

87731478025 is a deficient number, since it is larger than the sum of its proper divisors (21057391166).

87731478025 is an frugal number, since it uses more digits than its factorization.

87731478025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118488 (or 59244 counting only the distinct ones).

The product of its (nonzero) digits is 2634240, while the sum is 52.

The spelling of 87731478025 in words is "eighty-seven billion, seven hundred thirty-one million, four hundred seventy-eight thousand, twenty-five".