87139390 has 16 divisors (see below), whose sum is σ = 168916608. Its totient is φ = 32174496.

The previous prime is 87139369. The next prime is 87139417. The reversal of 87139390 is 9393178.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 335022 + ... + 335281.

It is an arithmetic number, because the mean of its divisors is an integer number (10557288).

Almost surely, 2^87139390 is an apocalyptic number.

87139390 is a deficient number, since it is larger than the sum of its proper divisors (81777218).

87139390 is a wasteful number, since it uses less digits than its factorization.

87139390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670323.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 87139390 is about 9334.8481508807. The cubic root of 87139390 is about 443.3412810053.

The spelling of 87139390 in words is "eighty-seven million, one hundred thirty-nine thousand, three hundred ninety".