78277 has 2 divisors, whose sum is σ = 78278. Its totient is φ = 78276.

The previous prime is 78259. The next prime is 78283. The reversal of 78277 is 77287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43681 + 34596 = 209^2 + 186^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78277 is a prime.

It is a super-2 number, since 2×78277² = 12254577458, which contains 22 as substring.

78277 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39138 + 39139.

It is an arithmetic number, because the mean of its divisors is an integer number (39139).

2⁷⁸²⁷⁷ is an apocalyptic number.

It is an amenable number.

78277 is a deficient number, since it is larger than the sum of its proper divisors (1).

78277 is an equidigital number, since it uses as much as digits as its factorization.

78277 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5488, while the sum is 31.

The square root of 78277 is about 279.7802709270. The cubic root of 78277 is about 42.7771051161. Note that the first 3 decimals are identical.

Subtracting from 78277 its reverse (77287), we obtain a triangular number (990 = T₄₄).

The spelling of 78277 in words is "seventy-eight thousand, two hundred seventy-seven".