72591637 has 4 divisors (see below), whose sum is σ = 72614080. Its totient is φ = 72569196.

The previous prime is 72591593. The next prime is 72591643. The reversal of 72591637 is 73619527.

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 72591637 - 2⁷ = 72591509 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 72591637.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72531637) 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, 5343 + ... + 13180.

It is an arithmetic number, because the mean of its divisors is an integer number (18153520).

Almost surely, 2^72591637 is an apocalyptic number.

It is an amenable number.

72591637 is a deficient number, since it is larger than the sum of its proper divisors (22443).

72591637 is a wasteful number, since it uses less digits than its factorization.

72591637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22442.

The product of its digits is 79380, while the sum is 40.

The square root of 72591637 is about 8520.0725935875. The cubic root of 72591637 is about 417.1531525922.

The spelling of 72591637 in words is "seventy-two million, five hundred ninety-one thousand, six hundred thirty-seven".