77072091 has 8 divisors (see below), whose sum is σ = 102807360. Its totient is φ = 51359112.

The previous prime is 77072081. The next prime is 77072137. The reversal of 77072091 is 19027077.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77072091 - 2⁵ = 77072059 is a prime.

It is a super-2 number, since 2×77072091² = 11880214422224562, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77072081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5836 + ... + 13718.

It is an arithmetic number, because the mean of its divisors is an integer number (12850920).

Almost surely, 2^77072091 is an apocalyptic number.

77072091 is a deficient number, since it is larger than the sum of its proper divisors (25735269).

77072091 is a wasteful number, since it uses less digits than its factorization.

77072091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11145.

The product of its (nonzero) digits is 6174, while the sum is 33.

The square root of 77072091 is about 8779.0711923301. The cubic root of 77072091 is about 425.5648149012.

The spelling of 77072091 in words is "seventy-seven million, seventy-two thousand, ninety-one".