77378925 has 48 divisors (see below), whose sum is σ = 145060160. Its totient is φ = 36080640.

The previous prime is 77378909. The next prime is 77378933. The reversal of 77378925 is 52987377.

It is not a de Polignac number, because 77378925 - 2⁴ = 77378909 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16437 + ... + 20613.

Almost surely, 2^77378925 is an apocalyptic number.

77378925 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

77378925 is a deficient number, since it is larger than the sum of its proper divisors (67681235).

77378925 is a wasteful number, since it uses less digits than its factorization.

77378925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4222 (or 4217 counting only the distinct ones).

The product of its digits is 740880, while the sum is 48.

The square root of 77378925 is about 8796.5291450663. The cubic root of 77378925 is about 426.1288100415.

The spelling of 77378925 in words is "seventy-seven million, three hundred seventy-eight thousand, nine hundred twenty-five".