86981520 has 80 divisors (see below), whose sum is σ = 285517440. Its totient is φ = 21829632.

The previous prime is 86981519. The next prime is 86981551. The reversal of 86981520 is 2518968.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6580 + ... + 14739.

It is an arithmetic number, because the mean of its divisors is an integer number (3568968).

Almost surely, 2^86981520 is an apocalyptic number.

86981520 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

86981520 is an abundant number, since it is smaller than the sum of its proper divisors (198535920).

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

86981520 is a wasteful number, since it uses less digits than its factorization.

86981520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21352 (or 21346 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 86981520 is about 9326.3883684951. The cubic root of 86981520 is about 443.0733860933.

The spelling of 86981520 in words is "eighty-six million, nine hundred eighty-one thousand, five hundred twenty".