76678991 has 2 divisors, whose sum is σ = 76678992. Its totient is φ = 76678990.

The previous prime is 76678967. The next prime is 76679039. The reversal of 76678991 is 19987667.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76678991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76678951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38339495 + 38339496.

It is an arithmetic number, because the mean of its divisors is an integer number (38339496).

Almost surely, 2^76678991 is an apocalyptic number.

76678991 is a deficient number, since it is larger than the sum of its proper divisors (1).

76678991 is an equidigital number, since it uses as much as digits as its factorization.

76678991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 53.

The square root of 76678991 is about 8756.6540984556. The cubic root of 76678991 is about 424.8400616179.

The spelling of 76678991 in words is "seventy-six million, six hundred seventy-eight thousand, nine hundred ninety-one".