72639653 has 4 divisors (see below), whose sum is σ = 72907968. Its totient is φ = 72371340.

The previous prime is 72639643. The next prime is 72639683. The reversal of 72639653 is 35693627.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72639653 - 2²⁴ = 55862437 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72639653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72639643) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 133751 + ... + 134292.

It is an arithmetic number, because the mean of its divisors is an integer number (18226992).

Almost surely, 2^72639653 is an apocalyptic number.

It is an amenable number.

72639653 is a deficient number, since it is larger than the sum of its proper divisors (268315).

72639653 is a wasteful number, since it uses less digits than its factorization.

72639653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268314.

The product of its digits is 204120, while the sum is 41.

The square root of 72639653 is about 8522.8899441445. The cubic root of 72639653 is about 417.2451081393.

The spelling of 72639653 in words is "seventy-two million, six hundred thirty-nine thousand, six hundred fifty-three".