72640073 has 8 divisors (see below), whose sum is σ = 79337280. Its totient is φ = 65958480.

The previous prime is 72640019. The next prime is 72640091. The reversal of 72640073 is 37004627.

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

It is a cyclic number.

It is not a de Polignac number, because 72640073 - 2²⁶ = 5531209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72640573) 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 7 ways as a sum of consecutive naturals, for example, 7223 + ... + 14051.

It is an arithmetic number, because the mean of its divisors is an integer number (9917160).

Almost surely, 2^72640073 is an apocalyptic number.

It is an amenable number.

72640073 is a deficient number, since it is larger than the sum of its proper divisors (6697207).

72640073 is a wasteful number, since it uses less digits than its factorization.

72640073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7807.

The product of its (nonzero) digits is 7056, while the sum is 29.

The square root of 72640073 is about 8522.9145836386. The cubic root of 72640073 is about 417.2459123034.

The spelling of 72640073 in words is "seventy-two million, six hundred forty thousand, seventy-three".