87224240 has 20 divisors (see below), whose sum is σ = 202796544. Its totient is φ = 34889664.

The previous prime is 87224237. The next prime is 87224251. The reversal of 87224240 is 4242278.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 545072 + ... + 545231.

Almost surely, 2^87224240 is an apocalyptic number.

87224240 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

87224240 is an abundant number, since it is smaller than the sum of its proper divisors (115572304).

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

87224240 is a wasteful number, since it uses less digits than its factorization.

87224240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090316 (or 1090310 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 29.

The square root of 87224240 is about 9339.3918431555. The cubic root of 87224240 is about 443.4851321559.

The spelling of 87224240 in words is "eighty-seven million, two hundred twenty-four thousand, two hundred forty".