87491140 has 24 divisors (see below), whose sum is σ = 200434752. Its totient is φ = 31814880.

The previous prime is 87491137. The next prime is 87491153. The reversal of 87491140 is 4119478.

It is a junction number, because it is equal to n+sod(n) for n = 87491096 and 87491105.

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, 198624 + ... + 199063.

It is an arithmetic number, because the mean of its divisors is an integer number (8351448).

Almost surely, 2^87491140 is an apocalyptic number.

It is an amenable number.

87491140 is an abundant number, since it is smaller than the sum of its proper divisors (112943612).

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

87491140 is a wasteful number, since it uses less digits than its factorization.

87491140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397707 (or 397705 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 87491140 is about 9353.6698680251. The cubic root of 87491140 is about 443.9370159285.

It can be divided in two parts, 8749 and 1140, that added together give a palindrome (9889).

The spelling of 87491140 in words is "eighty-seven million, four hundred ninety-one thousand, one hundred forty".