87212712 has 16 divisors (see below), whose sum is σ = 218031840. Its totient is φ = 29070896.

The previous prime is 87212707. The next prime is 87212789. The reversal of 87212712 is 21721278.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 87212712.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1816908 + ... + 1816955.

It is an arithmetic number, because the mean of its divisors is an integer number (13626990).

Almost surely, 2^87212712 is an apocalyptic number.

It is an amenable number.

87212712 is an abundant number, since it is smaller than the sum of its proper divisors (130819128).

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

87212712 is a wasteful number, since it uses less digits than its factorization.

87212712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3633872 (or 3633868 counting only the distinct ones).

The product of its digits is 3136, while the sum is 30.

The square root of 87212712 is about 9338.7746519551. The cubic root of 87212712 is about 443.4655935435.

The spelling of 87212712 in words is "eighty-seven million, two hundred twelve thousand, seven hundred twelve".