72640635 has 8 divisors (see below), whose sum is σ = 116225040. Its totient is φ = 38741664.

The previous prime is 72640573. The next prime is 72640637. The reversal of 72640635 is 53604627.

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

It is not a de Polignac number, because 72640635 - 2¹⁸ = 72378491 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72640596 and 72640605.

It is not an unprimeable number, because it can be changed into a prime (72640637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2421340 + ... + 2421369.

It is an arithmetic number, because the mean of its divisors is an integer number (14528130).

Almost surely, 2^72640635 is an apocalyptic number.

72640635 is a deficient number, since it is larger than the sum of its proper divisors (43584405).

72640635 is a wasteful number, since it uses less digits than its factorization.

72640635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4842717.

The product of its (nonzero) digits is 30240, while the sum is 33.

The square root of 72640635 is about 8522.9475535169. The cubic root of 72640635 is about 417.2469883467.

The spelling of 72640635 in words is "seventy-two million, six hundred forty thousand, six hundred thirty-five".