77699425 has 18 divisors (see below), whose sum is σ = 97887398. Its totient is φ = 61175040.

The previous prime is 77699411. The next prime is 77699437. The reversal of 77699425 is 52499677.

It can be written as a sum of positive squares in 3 ways, for example, as 3876961 + 73822464 = 1969^2 + 8592^2 .

It is not a de Polignac number, because 77699425 - 2¹⁵ = 77666657 is a prime.

It is a Duffinian number.

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 17 ways as a sum of consecutive naturals, for example, 433986 + ... + 434164.

Almost surely, 2^77699425 is an apocalyptic number.

It is an amenable number.

77699425 is a deficient number, since it is larger than the sum of its proper divisors (20187973).

77699425 is an equidigital number, since it uses as much as digits as its factorization.

77699425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465 (or 281 counting only the distinct ones).

The product of its digits is 952560, while the sum is 49.

The square root of 77699425 is about 8814.7277326075. The cubic root of 77699425 is about 426.7163350246.

The spelling of 77699425 in words is "seventy-seven million, six hundred ninety-nine thousand, four hundred twenty-five".