72215424 has 48 divisors (see below), whose sum is σ = 207810720. Its totient is φ = 24071424.

The previous prime is 72215369. The next prime is 72215431. The reversal of 72215424 is 42451227.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30192 + ... + 32495.

It is an arithmetic number, because the mean of its divisors is an integer number (4329390).

Almost surely, 2^72215424 is an apocalyptic number.

It is an amenable number.

72215424 is an abundant number, since it is smaller than the sum of its proper divisors (135595296).

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

72215424 is a wasteful number, since it uses less digits than its factorization.

72215424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62707 (or 62692 counting only the distinct ones).

The product of its digits is 4480, while the sum is 27.

The square root of 72215424 is about 8497.9658742549. The cubic root of 72215424 is about 416.4312588824.

It can be divided in two parts, 72 and 215424, that added together give a triangular number (215496 = T₆₅₆).

The spelling of 72215424 in words is "seventy-two million, two hundred fifteen thousand, four hundred twenty-four".