78877 has 2 divisors, whose sum is σ = 78878. Its totient is φ = 78876.

The previous prime is 78857. The next prime is 78887. The reversal of 78877 is 77887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63001 + 15876 = 251^2 + 126^2 .

It is a cyclic number.

It is not a de Polignac number, because 78877 - 2¹¹ = 76829 is a prime.

It is a super-2 number, since 2×78877² = 12443162258, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39438 + 39439.

It is an arithmetic number, because the mean of its divisors is an integer number (39439).

2⁷⁸⁸⁷⁷ is an apocalyptic number.

It is an amenable number.

78877 is a deficient number, since it is larger than the sum of its proper divisors (1).

78877 is an equidigital number, since it uses as much as digits as its factorization.

78877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21952, while the sum is 37.

The square root of 78877 is about 280.8504940355. The cubic root of 78877 is about 42.8861237843.

Subtracting from 78877 its reverse (77887), we obtain a triangular number (990 = T₄₄).

The spelling of 78877 in words is "seventy-eight thousand, eight hundred seventy-seven".