77677725 has 24 divisors (see below), whose sum is σ = 128925280. Its totient is φ = 41267520.

The previous prime is 77677711. The next prime is 77677727. The reversal of 77677725 is 52777677.

It is a happy number.

It is not a de Polignac number, because 77677725 - 2⁷ = 77677597 is a prime.

It is a super-2 number, since 2×77677725² = 12067657922351250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77677727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18906 + ... + 22644.

Almost surely, 2^77677725 is an apocalyptic number.

77677725 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

77677725 is a deficient number, since it is larger than the sum of its proper divisors (51247555).

77677725 is a wasteful number, since it uses less digits than its factorization.

77677725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4029 (or 4024 counting only the distinct ones).

The product of its digits is 1008420, while the sum is 48.

The square root of 77677725 is about 8813.4967521410. The cubic root of 77677725 is about 426.6766066885.

Subtracting from 77677725 its sum of digits (48), we obtain a palindrome (77677677).

The spelling of 77677725 in words is "seventy-seven million, six hundred seventy-seven thousand, seven hundred twenty-five".