87213240 has 128 divisors (see below), whose sum is σ = 303436800. Its totient is φ = 22239360.

The previous prime is 87213229. The next prime is 87213253. The reversal of 87213240 is 4231278.

It is a super-2 number, since 2×87213240² = 15212298462595200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23085 + ... + 26595.

It is an arithmetic number, because the mean of its divisors is an integer number (2370600).

Almost surely, 2^87213240 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 87213240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151718400).

87213240 is an abundant number, since it is smaller than the sum of its proper divisors (216223560).

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

87213240 is a wasteful number, since it uses less digits than its factorization.

87213240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3554 (or 3544 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 87213240 is about 9338.8029211457. The cubic root of 87213240 is about 443.4664884794.

The spelling of 87213240 in words is "eighty-seven million, two hundred thirteen thousand, two hundred forty".