72558424 has 8 divisors (see below), whose sum is σ = 136047060. Its totient is φ = 36279208.

The previous prime is 72558403. The next prime is 72558427. The reversal of 72558424 is 42485527.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72558427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4534894 + ... + 4534909.

Almost surely, 2^72558424 is an apocalyptic number.

It is an amenable number.

72558424 is a deficient number, since it is larger than the sum of its proper divisors (63488636).

72558424 is a wasteful number, since it uses less digits than its factorization.

72558424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9069809 (or 9069805 counting only the distinct ones).

The product of its digits is 89600, while the sum is 37.

The square root of 72558424 is about 8518.1232674809. The cubic root of 72558424 is about 417.0895225755.

The spelling of 72558424 in words is "seventy-two million, five hundred fifty-eight thousand, four hundred twenty-four".