72749638 has 16 divisors (see below), whose sum is σ = 117665856. Its totient is φ = 33534720.

The previous prime is 72749627. The next prime is 72749657. The reversal of 72749638 is 83694727.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30870 + ... + 33142.

It is an arithmetic number, because the mean of its divisors is an integer number (7354116).

Almost surely, 2^72749638 is an apocalyptic number.

72749638 is a deficient number, since it is larger than the sum of its proper divisors (44916218).

72749638 is a wasteful number, since it uses less digits than its factorization.

72749638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3519.

The product of its digits is 508032, while the sum is 46.

The square root of 72749638 is about 8529.3398337738. The cubic root of 72749638 is about 417.4555880424.

The spelling of 72749638 in words is "seventy-two million, seven hundred forty-nine thousand, six hundred thirty-eight".