87685840 has 40 divisors (see below), whose sum is σ = 222405408. Its totient is φ = 31885440.

The previous prime is 87685837. The next prime is 87685907. The reversal of 87685840 is 4858678.

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 (46) coincides with the sum of the digits of its prime factors.

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, 48942 + ... + 50701.

Almost surely, 2^87685840 is an apocalyptic number.

87685840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

87685840 is an abundant number, since it is smaller than the sum of its proper divisors (134719568).

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

87685840 is a wasteful number, since it uses less digits than its factorization.

87685840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99667 (or 99661 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 46.

The square root of 87685840 is about 9364.0717639283. The cubic root of 87685840 is about 444.2660797244.

The spelling of 87685840 in words is "eighty-seven million, six hundred eighty-five thousand, eight hundred forty".