87057840 has 40 divisors (see below), whose sum is σ = 269880048. Its totient is φ = 23215360.

The previous prime is 87057823. The next prime is 87057847. The reversal of 87057840 is 4875078.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (87057847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181131 + ... + 181610.

Almost surely, 2^87057840 is an apocalyptic number.

87057840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

87057840 is an abundant number, since it is smaller than the sum of its proper divisors (182822208).

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

87057840 is a wasteful number, since it uses less digits than its factorization.

87057840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362757 (or 362751 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 39.

The square root of 87057840 is about 9330.4790873781. The cubic root of 87057840 is about 443.2029365061.

The spelling of 87057840 in words is "eighty-seven million, fifty-seven thousand, eight hundred forty".