87720910 has 16 divisors (see below), whose sum is σ = 166208400. Its totient is φ = 33241536.

The previous prime is 87720869. The next prime is 87720923. The reversal of 87720910 is 1902778.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230655 + ... + 231034.

It is an arithmetic number, because the mean of its divisors is an integer number (10388025).

Almost surely, 2^87720910 is an apocalyptic number.

87720910 is a deficient number, since it is larger than the sum of its proper divisors (78487490).

87720910 is a wasteful number, since it uses less digits than its factorization.

87720910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461715.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 87720910 is about 9365.9441595602. The cubic root of 87720910 is about 444.3252999845.

The spelling of 87720910 in words is "eighty-seven million, seven hundred twenty thousand, nine hundred ten".