87121590 has 32 divisors (see below), whose sum is σ = 211169376. Its totient is φ = 23001600.

The previous prime is 87121571. The next prime is 87121591. The reversal of 87121590 is 9512178.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87121591) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11347 + ... + 17406.

It is an arithmetic number, because the mean of its divisors is an integer number (6599043).

Almost surely, 2^87121590 is an apocalyptic number.

87121590 is an abundant number, since it is smaller than the sum of its proper divisors (124047786).

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

87121590 is a wasteful number, since it uses less digits than its factorization.

87121590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28864.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 87121590 is about 9333.8946854997. The cubic root of 87121590 is about 443.3110917793.

The spelling of 87121590 in words is "eighty-seven million, one hundred twenty-one thousand, five hundred ninety".