72904647 has 8 divisors (see below), whose sum is σ = 97273456. Its totient is φ = 48569472.

The previous prime is 72904633. The next prime is 72904693. The reversal of 72904647 is 74640927.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72904647 - 2⁶ = 72904583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72904697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2818 + ... + 12399.

It is an arithmetic number, because the mean of its divisors is an integer number (12159182).

Almost surely, 2^72904647 is an apocalyptic number.

72904647 is a deficient number, since it is larger than the sum of its proper divisors (24368809).

72904647 is a wasteful number, since it uses less digits than its factorization.

72904647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16817.

The product of its (nonzero) digits is 84672, while the sum is 39.

The square root of 72904647 is about 8538.4218096789. The cubic root of 72904647 is about 417.7518711589.

It can be divided in two parts, 7290464 and 7, that added together give a triangular number (7290471 = T₃₈₁₈).

The spelling of 72904647 in words is "seventy-two million, nine hundred four thousand, six hundred forty-seven".