77976869 has 2 divisors, whose sum is σ = 77976870. Its totient is φ = 77976868.

The previous prime is 77976823. The next prime is 77976883. The reversal of 77976869 is 96867977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68674369 + 9302500 = 8287^2 + 3050^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77976869 is a prime.

It is a super-2 number, since 2×77976869² = 12160784198086322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77976469) 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 as a sum of consecutive naturals, namely, 38988434 + 38988435.

It is an arithmetic number, because the mean of its divisors is an integer number (38988435).

Almost surely, 2^77976869 is an apocalyptic number.

It is an amenable number.

77976869 is a deficient number, since it is larger than the sum of its proper divisors (1).

77976869 is an equidigital number, since it uses as much as digits as its factorization.

77976869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8001504, while the sum is 59.

The square root of 77976869 is about 8830.4512342235. The cubic root of 77976869 is about 427.2236285805.

The spelling of 77976869 in words is "seventy-seven million, nine hundred seventy-six thousand, eight hundred sixty-nine".