77855 has 8 divisors (see below), whose sum is σ = 97632. Its totient is φ = 59488.

The previous prime is 77849. The next prime is 77863. The reversal of 77855 is 55877.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77855 - 2⁴ = 77839 is a prime.

It is a super-2 number, since 2×77855² = 12122802050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224 + ... + 453.

It is an arithmetic number, because the mean of its divisors is an integer number (12204).

2⁷⁷⁸⁵⁵ is an apocalyptic number.

77855 is a deficient number, since it is larger than the sum of its proper divisors (19777).

77855 is a wasteful number, since it uses less digits than its factorization.

77855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705.

The product of its digits is 9800, while the sum is 32.

The square root of 77855 is about 279.0250884777. The cubic root of 77855 is about 42.7000945176.

The spelling of 77855 in words is "seventy-seven thousand, eight hundred fifty-five".