87402990 has 64 divisors (see below), whose sum is σ = 220340736. Its totient is φ = 22146432.

The previous prime is 87402949. The next prime is 87403003. The reversal of 87402990 is 9920478.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 135609 + ... + 136251.

It is an arithmetic number, because the mean of its divisors is an integer number (3442824).

Almost surely, 2^87402990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87402990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110170368).

87402990 is an abundant number, since it is smaller than the sum of its proper divisors (132937746).

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

87402990 is a wasteful number, since it uses less digits than its factorization.

87402990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 873.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 87402990 is about 9348.9566262765. The cubic root of 87402990 is about 443.7878724537.

The spelling of 87402990 in words is "eighty-seven million, four hundred two thousand, nine hundred ninety".