77975 has 6 divisors (see below), whose sum is σ = 96720. Its totient is φ = 62360.

The previous prime is 77969. The next prime is 77977. The reversal of 77975 is 57977.

It is not a de Polignac number, because 77975 - 2⁸ = 77719 is a prime.

It is a nialpdrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77977) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1535 + ... + 1584.

It is an arithmetic number, because the mean of its divisors is an integer number (16120).

2⁷⁷⁹⁷⁵ is an apocalyptic number.

77975 is a deficient number, since it is larger than the sum of its proper divisors (18745).

77975 is a wasteful number, since it uses less digits than its factorization.

77975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3129 (or 3124 counting only the distinct ones).

The product of its digits is 15435, while the sum is 35.

The square root of 77975 is about 279.2400401089. The cubic root of 77975 is about 42.7220215229.

The spelling of 77975 in words is "seventy-seven thousand, nine hundred seventy-five".