72640044 has 24 divisors (see below), whose sum is σ = 188326320. Its totient is φ = 24213312.

The previous prime is 72640019. The next prime is 72640091. The reversal of 72640044 is 44004627.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 7 ways as a sum of consecutive naturals, for example, 336189 + ... + 336404.

It is an arithmetic number, because the mean of its divisors is an integer number (7846930).

Almost surely, 2^72640044 is an apocalyptic number.

It is an amenable number.

72640044 is an abundant number, since it is smaller than the sum of its proper divisors (115686276).

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

72640044 is a wasteful number, since it uses less digits than its factorization.

72640044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672606 (or 672598 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 27.

The square root of 72640044 is about 8522.9128823425. The cubic root of 72640044 is about 417.2458567779.

The spelling of 72640044 in words is "seventy-two million, six hundred forty thousand, forty-four".