87809490 has 24 divisors (see below), whose sum is σ = 228304908. Its totient is φ = 23415840.

The previous prime is 87809479. The next prime is 87809503. The reversal of 87809490 is 9490878.

87809490 is a `hidden beast` number, since 87 + 80 + 9 + 490 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 87778161 + 31329 = 9369^2 + 177^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 487741 + ... + 487920.

Almost surely, 2^87809490 is an apocalyptic number.

87809490 is an abundant number, since it is smaller than the sum of its proper divisors (140495418).

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

87809490 is a wasteful number, since it uses less digits than its factorization.

87809490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975674 (or 975671 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 87809490 is about 9370.6718008903. The cubic root of 87809490 is about 444.4748085968.

The spelling of 87809490 in words is "eighty-seven million, eight hundred nine thousand, four hundred ninety".