72739451 has 4 divisors (see below), whose sum is σ = 72758904. Its totient is φ = 72720000.

The previous prime is 72739441. The next prime is 72739477. The reversal of 72739451 is 15493727.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72739451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72739441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2150 + ... + 12251.

It is an arithmetic number, because the mean of its divisors is an integer number (18189726).

Almost surely, 2^72739451 is an apocalyptic number.

72739451 is a deficient number, since it is larger than the sum of its proper divisors (19453).

72739451 is a wasteful number, since it uses less digits than its factorization.

72739451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19452.

The product of its digits is 52920, while the sum is 38.

The square root of 72739451 is about 8528.7426388654. The cubic root of 72739451 is about 417.4361019496.

The spelling of 72739451 in words is "seventy-two million, seven hundred thirty-nine thousand, four hundred fifty-one".