76638379 has 2 divisors, whose sum is σ = 76638380. Its totient is φ = 76638378.

The previous prime is 76638377. The next prime is 76638383. The reversal of 76638379 is 97383667.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 76638379 - 2¹ = 76638377 is a prime.

It is a super-2 number, since 2×76638379² = 11746882271495282, which contains 22 as substring.

Together with 76638377, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (76638377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38319189 + 38319190.

It is an arithmetic number, because the mean of its divisors is an integer number (38319190).

Almost surely, 2^76638379 is an apocalyptic number.

76638379 is a deficient number, since it is larger than the sum of its proper divisors (1).

76638379 is an equidigital number, since it uses as much as digits as its factorization.

76638379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 49.

The square root of 76638379 is about 8754.3348690806. The cubic root of 76638379 is about 424.7650447574.

The spelling of 76638379 in words is "seventy-six million, six hundred thirty-eight thousand, three hundred seventy-nine".