87212784 has 20 divisors (see below), whose sum is σ = 225299816. Its totient is φ = 29070912.

The previous prime is 87212707. The next prime is 87212789. The reversal of 87212784 is 48721278.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87212789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 908419 + ... + 908514.

Almost surely, 2^87212784 is an apocalyptic number.

It is an amenable number.

87212784 is an abundant number, since it is smaller than the sum of its proper divisors (138087032).

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

87212784 is a wasteful number, since it uses less digits than its factorization.

87212784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1816944 (or 1816938 counting only the distinct ones).

The product of its digits is 50176, while the sum is 39.

The square root of 87212784 is about 9338.7785068498. The cubic root of 87212784 is about 443.4657155805.

The spelling of 87212784 in words is "eighty-seven million, two hundred twelve thousand, seven hundred eighty-four".