87120612 has 18 divisors (see below), whose sum is σ = 220221638. Its totient is φ = 29040192.

The previous prime is 87120599. The next prime is 87120617. The reversal of 87120612 is 21602178.

It can be written as a sum of positive squares in only one way, i.e., 48108096 + 39012516 = 6936^2 + 6246^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (87120617) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 1209973 + ... + 1210044.

Almost surely, 2^87120612 is an apocalyptic number.

It is an amenable number.

87120612 is an abundant number, since it is smaller than the sum of its proper divisors (133101026).

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

87120612 is a wasteful number, since it uses less digits than its factorization.

87120612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2420027 (or 2420022 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 87120612 is about 9333.8422956465. The cubic root of 87120612 is about 443.3094329488.

The spelling of 87120612 in words is "eighty-seven million, one hundred twenty thousand, six hundred twelve".