72405558 has 24 divisors (see below), whose sum is σ = 157539096. Its totient is φ = 24033600.

The previous prime is 72405527. The next prime is 72405563. The reversal of 72405558 is 85550427.

It is a happy number.

It is a super-3 number, since 3×72405558³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4008 + ... + 12683.

It is an arithmetic number, because the mean of its divisors is an integer number (6564129).

Almost surely, 2^72405558 is an apocalyptic number.

72405558 is an abundant number, since it is smaller than the sum of its proper divisors (85133538).

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

72405558 is a wasteful number, since it uses less digits than its factorization.

72405558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16940 (or 16937 counting only the distinct ones).

The product of its (nonzero) digits is 56000, while the sum is 36.

The square root of 72405558 is about 8509.1455505239. The cubic root of 72405558 is about 416.7964087344.

The spelling of 72405558 in words is "seventy-two million, four hundred five thousand, five hundred fifty-eight".