87801557 has 16 divisors (see below), whose sum is σ = 93768192. Its totient is φ = 82038000.

The previous prime is 87801547. The next prime is 87801559. The reversal of 87801557 is 75510878.

It is a cyclic number.

It is not a de Polignac number, because 87801557 - 2¹⁶ = 87736021 is a prime.

It is a super-2 number, since 2×87801557² = 15418226823248498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87801559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 349682 + ... + 349932.

It is an arithmetic number, because the mean of its divisors is an integer number (5860512).

Almost surely, 2^87801557 is an apocalyptic number.

It is an amenable number.

87801557 is a deficient number, since it is larger than the sum of its proper divisors (5966635).

87801557 is a wasteful number, since it uses less digits than its factorization.

87801557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568.

The product of its (nonzero) digits is 78400, while the sum is 41.

The square root of 87801557 is about 9370.2485025745. The cubic root of 87801557 is about 444.4614230852.

The spelling of 87801557 in words is "eighty-seven million, eight hundred one thousand, five hundred fifty-seven".