72791081 has 4 divisors (see below), whose sum is σ = 79408464. Its totient is φ = 66173700.

The previous prime is 72791077. The next prime is 72791123. The reversal of 72791081 is 18019727.

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 72791081 - 2² = 72791077 is a prime.

It is a super-2 number, since 2×72791081² = 10597082946297122, which contains 22 as substring.

It is a Duffinian 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, 3308675 + ... + 3308696.

It is an arithmetic number, because the mean of its divisors is an integer number (19852116).

Almost surely, 2^72791081 is an apocalyptic number.

It is an amenable number.

72791081 is a deficient number, since it is larger than the sum of its proper divisors (6617383).

72791081 is a wasteful number, since it uses less digits than its factorization.

72791081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6617382.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 72791081 is about 8531.7689256097. The cubic root of 72791081 is about 417.5348430887.

The spelling of 72791081 in words is "seventy-two million, seven hundred ninety-one thousand, eighty-one".