77765825 has 12 divisors (see below), whose sum is σ = 99541248. Its totient is φ = 60205200.

The previous prime is 77765813. The next prime is 77765827. The reversal of 77765825 is 52856777.

It is a happy number.

It is not a de Polignac number, because 77765825 - 2¹⁸ = 77503681 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77765825.

It is not an unprimeable number, because it can be changed into a prime (77765827) 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 11 ways as a sum of consecutive naturals, for example, 49397 + ... + 50946.

It is an arithmetic number, because the mean of its divisors is an integer number (8295104).

Almost surely, 2^77765825 is an apocalyptic number.

It is an amenable number.

77765825 is a deficient number, since it is larger than the sum of its proper divisors (21775423).

77765825 is a wasteful number, since it uses less digits than its factorization.

77765825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100384 (or 100379 counting only the distinct ones).

The product of its digits is 823200, while the sum is 47.

The square root of 77765825 is about 8818.4933520415. The cubic root of 77765825 is about 426.8378541449.

The spelling of 77765825 in words is "seventy-seven million, seven hundred sixty-five thousand, eight hundred twenty-five".