87120605 has 64 divisors (see below), whose sum is σ = 132814080. Its totient is φ = 54362880.

The previous prime is 87120599. The next prime is 87120617. The reversal of 87120605 is 50602178.

It is not a de Polignac number, because 87120605 - 2²⁴ = 70343389 is a prime.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1643759 + ... + 1643811.

It is an arithmetic number, because the mean of its divisors is an integer number (2075220).

Almost surely, 2^87120605 is an apocalyptic number.

It is an amenable number.

87120605 is a deficient number, since it is larger than the sum of its proper divisors (45693475).

87120605 is a wasteful number, since it uses less digits than its factorization.

87120605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 87120605 is about 9333.8419206670. The cubic root of 87120605 is about 443.3094210757.

It can be divided in two parts, 87120 and 605, that multiplied together give a square (52707600 = 7260²).

The spelling of 87120605 in words is "eighty-seven million, one hundred twenty thousand, six hundred five".