87212736 has 168 divisors, whose sum is σ = 283839920. Its totient is φ = 25380864.

The previous prime is 87212707. The next prime is 87212789. The reversal of 87212736 is 63721278.

It is a super-2 number, since 2×87212736² = 15212122641211392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 87212736.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 141966 + ... + 142578.

Almost surely, 2^87212736 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87212736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141919960).

87212736 is an abundant number, since it is smaller than the sum of its proper divisors (196627184).

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

87212736 is a wasteful number, since it uses less digits than its factorization.

87212736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663 (or 650 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 87212736 is about 9338.7759369202. The cubic root of 87212736 is about 443.4656342225.

The spelling of 87212736 in words is "eighty-seven million, two hundred twelve thousand, seven hundred thirty-six".