72595991 has 4 divisors (see below), whose sum is σ = 78180312. Its totient is φ = 67011672.

The previous prime is 72595987. The next prime is 72596003. The reversal of 72595991 is 19959527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19959527 = 7 ⋅2851361.

It is not a de Polignac number, because 72595991 - 2² = 72595987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72595931) 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, 2792141 + ... + 2792166.

It is an arithmetic number, because the mean of its divisors is an integer number (19545078).

Almost surely, 2^72595991 is an apocalyptic number.

72595991 is a deficient number, since it is larger than the sum of its proper divisors (5584321).

72595991 is a wasteful number, since it uses less digits than its factorization.

72595991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5584320.

The product of its digits is 255150, while the sum is 47.

The square root of 72595991 is about 8520.3281040110. The cubic root of 72595991 is about 417.1614926186.

The spelling of 72595991 in words is "seventy-two million, five hundred ninety-five thousand, nine hundred ninety-one".