76227991 has 4 divisors (see below), whose sum is σ = 87117712. Its totient is φ = 65338272.

The previous prime is 76227989. The next prime is 76228007. The reversal of 76227991 is 19972267.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 76227991 - 2¹ = 76227989 is a prime.

It is a super-2 number, since 2×76227991² = 11621413223792162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76227901) 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 3 ways as a sum of consecutive naturals, for example, 5444850 + ... + 5444863.

It is an arithmetic number, because the mean of its divisors is an integer number (21779428).

Almost surely, 2^76227991 is an apocalyptic number.

76227991 is a deficient number, since it is larger than the sum of its proper divisors (10889721).

76227991 is a wasteful number, since it uses less digits than its factorization.

76227991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10889720.

The product of its digits is 95256, while the sum is 43.

The square root of 76227991 is about 8730.8642756602. The cubic root of 76227991 is about 424.0055012191.

The spelling of 76227991 in words is "seventy-six million, two hundred twenty-seven thousand, nine hundred ninety-one".