87919640 has 32 divisors (see below), whose sum is σ = 198110880. Its totient is φ = 35116032.

The previous prime is 87919603. The next prime is 87919661. The reversal of 87919640 is 4691978.

It is a junction number, because it is equal to n+sod(n) for n = 87919591 and 87919600.

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, 37544 + ... + 39816.

It is an arithmetic number, because the mean of its divisors is an integer number (6190965).

Almost surely, 2^87919640 is an apocalyptic number.

It is an amenable number.

87919640 is an abundant number, since it is smaller than the sum of its proper divisors (110191240).

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

87919640 is a wasteful number, since it uses less digits than its factorization.

87919640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3251 (or 3247 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 87919640 is about 9376.5473389729. The cubic root of 87919640 is about 444.6605836679.

The spelling of 87919640 in words is "eighty-seven million, nine hundred nineteen thousand, six hundred forty".