77979225 has 24 divisors (see below), whose sum is σ = 129179232. Its totient is φ = 41507200.

The previous prime is 77979217. The next prime is 77979227. The reversal of 77979225 is 52297977.

It is not a de Polignac number, because 77979225 - 2³ = 77979217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77979227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70930 + ... + 72020.

It is an arithmetic number, because the mean of its divisors is an integer number (5382468).

Almost surely, 2^77979225 is an apocalyptic number.

77979225 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

77979225 is a deficient number, since it is larger than the sum of its proper divisors (51200007).

77979225 is a wasteful number, since it uses less digits than its factorization.

77979225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2057 (or 2052 counting only the distinct ones).

The product of its digits is 555660, while the sum is 48.

The square root of 77979225 is about 8830.5846352323. The cubic root of 77979225 is about 427.2279312613.

The spelling of 77979225 in words is "seventy-seven million, nine hundred seventy-nine thousand, two hundred twenty-five".