87755720 has 32 divisors (see below), whose sum is σ = 212640120. Its totient is φ = 32401920.

The previous prime is 87755671. The next prime is 87755743. The reversal of 87755720 is 2755778.

It can be written as a sum of positive squares in 4 ways, for example, as 43586404 + 44169316 = 6602^2 + 6646^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83861 + ... + 84900.

Almost surely, 2^87755720 is an apocalyptic number.

It is an amenable number.

87755720 is an abundant number, since it is smaller than the sum of its proper divisors (124884400).

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

87755720 is a wasteful number, since it uses less digits than its factorization.

87755720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168785 (or 168781 counting only the distinct ones).

The product of its (nonzero) digits is 137200, while the sum is 41.

The square root of 87755720 is about 9367.8023036356. The cubic root of 87755720 is about 444.3840655941.

The spelling of 87755720 in words is "eighty-seven million, seven hundred fifty-five thousand, seven hundred twenty".