77945025 has 24 divisors (see below), whose sum is σ = 131871520. Its totient is φ = 40602240.

The previous prime is 77944969. The next prime is 77945081. The reversal of 77945025 is 52054977.

It is an interprime number because it is at equal distance from previous prime (77944969) and next prime (77945081).

It is not a de Polignac number, because 77945025 - 2¹⁶ = 77879489 is a prime.

It is an unprimeable number.

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, 8860 + ... + 15309.

Almost surely, 2^77945025 is an apocalyptic number.

77945025 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

77945025 is a deficient number, since it is larger than the sum of its proper divisors (53926495).

77945025 is a wasteful number, since it uses less digits than its factorization.

77945025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24225 (or 24220 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 39.

The square root of 77945025 is about 8828.6479712355. The cubic root of 77945025 is about 427.1654644875.

The spelling of 77945025 in words is "seventy-seven million, nine hundred forty-five thousand, twenty-five".