72791911 has 4 divisors (see below), whose sum is σ = 72911272. Its totient is φ = 72672552.

The previous prime is 72791903. The next prime is 72791947. The reversal of 72791911 is 11919727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11919727 = 23 ⋅518249.

It is a cyclic number.

It is not a de Polignac number, because 72791911 - 2³ = 72791903 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 (72791981) 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, 58761 + ... + 59986.

It is an arithmetic number, because the mean of its divisors is an integer number (18227818).

Almost surely, 2^72791911 is an apocalyptic number.

72791911 is a deficient number, since it is larger than the sum of its proper divisors (119361).

72791911 is a wasteful number, since it uses less digits than its factorization.

72791911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119360.

The product of its digits is 7938, while the sum is 37.

The square root of 72791911 is about 8531.8175672010. The cubic root of 72791911 is about 417.5364300624.

The spelling of 72791911 in words is "seventy-two million, seven hundred ninety-one thousand, nine hundred eleven".