77983877 has 2 divisors, whose sum is σ = 77983878. Its totient is φ = 77983876.

The previous prime is 77983859. The next prime is 77983883. The reversal of 77983877 is 77838977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48455521 + 29528356 = 6961^2 + 5434^2 .

It is a cyclic number.

It is not a de Polignac number, because 77983877 - 2²⁰ = 76935301 is a prime.

It is a super-2 number, since 2×77983877² = 12162970143902258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77983177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38991938 + 38991939.

It is an arithmetic number, because the mean of its divisors is an integer number (38991939).

Almost surely, 2^77983877 is an apocalyptic number.

It is an amenable number.

77983877 is a deficient number, since it is larger than the sum of its proper divisors (1).

77983877 is an equidigital number, since it uses as much as digits as its factorization.

77983877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4148928, while the sum is 56.

The square root of 77983877 is about 8830.8480340226. The cubic root of 77983877 is about 427.2364267925.

The spelling of 77983877 in words is "seventy-seven million, nine hundred eighty-three thousand, eight hundred seventy-seven".