76688991 has 16 divisors (see below), whose sum is σ = 113762400. Its totient is φ = 51058944.

The previous prime is 76688977. The next prime is 76689001. The reversal of 76688991 is 19988667.

It is not a de Polignac number, because 76688991 - 2¹⁹ = 76164703 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76688951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27535 + ... + 30191.

It is an arithmetic number, because the mean of its divisors is an integer number (7110150).

Almost surely, 2^76688991 is an apocalyptic number.

76688991 is a deficient number, since it is larger than the sum of its proper divisors (37073409).

76688991 is a wasteful number, since it uses less digits than its factorization.

76688991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3735 (or 3729 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 76688991 is about 8757.2250741887. The cubic root of 76688991 is about 424.8585291534.

The spelling of 76688991 in words is "seventy-six million, six hundred eighty-eight thousand, nine hundred ninety-one".