87731520 has 56 divisors (see below), whose sum is σ = 278550624. Its totient is φ = 23394816.

The previous prime is 87731461. The next prime is 87731521. The reversal of 87731520 is 2513778.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87731521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44734 + ... + 46653.

Almost surely, 2^87731520 is an apocalyptic number.

87731520 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

87731520 is an abundant number, since it is smaller than the sum of its proper divisors (190819104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87731520 is a wasteful number, since it uses less digits than its factorization.

87731520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91407 (or 91397 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 87731520 is about 9366.5105562317. The cubic root of 87731520 is about 444.3432132406.

The spelling of 87731520 in words is "eighty-seven million, seven hundred thirty-one thousand, five hundred twenty".