72593991 has 12 divisors (see below), whose sum is σ = 107089632. Its totient is φ = 47366016.

The previous prime is 72593981. The next prime is 72594017. The reversal of 72593991 is 19939527.

It is a happy number.

72593991 is a `hidden beast` number, since 7 + 259 + 399 + 1 = 666.

It is not a de Polignac number, because 72593991 - 2⁵ = 72593959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72593981) 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 11 ways as a sum of consecutive naturals, for example, 85386 + ... + 86231.

It is an arithmetic number, because the mean of its divisors is an integer number (8924136).

Almost surely, 2^72593991 is an apocalyptic number.

72593991 is a deficient number, since it is larger than the sum of its proper divisors (34495641).

72593991 is a wasteful number, since it uses less digits than its factorization.

72593991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171670 (or 171667 counting only the distinct ones).

The product of its digits is 153090, while the sum is 45.

The square root of 72593991 is about 8520.2107368304. The cubic root of 72593991 is about 417.1576616878.

The spelling of 72593991 in words is "seventy-two million, five hundred ninety-three thousand, nine hundred ninety-one".