77788025 has 24 divisors (see below), whose sum is σ = 110647680. Its totient is φ = 53141760.

The previous prime is 77788013. The next prime is 77788027. The reversal of 77788025 is 52088777.

It is not a de Polignac number, because 77788025 - 2¹⁰ = 77787001 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (77788027) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58316 + ... + 59634.

It is an arithmetic number, because the mean of its divisors is an integer number (4610320).

Almost surely, 2^77788025 is an apocalyptic number.

It is an amenable number.

77788025 is a deficient number, since it is larger than the sum of its proper divisors (32859655).

77788025 is a wasteful number, since it uses less digits than its factorization.

77788025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1673 (or 1668 counting only the distinct ones).

The product of its (nonzero) digits is 219520, while the sum is 44.

The square root of 77788025 is about 8819.7519806398. The cubic root of 77788025 is about 426.8784670954.

The spelling of 77788025 in words is "seventy-seven million, seven hundred eighty-eight thousand, twenty-five".