87424240 has 20 divisors (see below), whose sum is σ = 203261544. Its totient is φ = 34969664.

The previous prime is 87424231. The next prime is 87424261. The reversal of 87424240 is 4242478.

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

It is a congruent number.

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, 546322 + ... + 546481.

Almost surely, 2^87424240 is an apocalyptic number.

87424240 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

87424240 is an abundant number, since it is smaller than the sum of its proper divisors (115837304).

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

87424240 is a wasteful number, since it uses less digits than its factorization.

87424240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092816 (or 1092810 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 31.

The square root of 87424240 is about 9350.0930476654. The cubic root of 87424240 is about 443.8238350988.

The spelling of 87424240 in words is "eighty-seven million, four hundred twenty-four thousand, two hundred forty".