77786256 has 20 divisors (see below), whose sum is σ = 200947952. Its totient is φ = 25928736.

The previous prime is 77786243. The next prime is 77786257. The reversal of 77786256 is 65268777.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 1620547 = 77786256 / (7 + 7 + 7 + 8 + 6 + 2 + 5 + 6).

It is not an unprimeable number, because it can be changed into a prime (77786257) 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 3 ways as a sum of consecutive naturals, for example, 810226 + ... + 810321.

Almost surely, 2^77786256 is an apocalyptic number.

It is an amenable number.

77786256 is an abundant number, since it is smaller than the sum of its proper divisors (123161696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77786256 is a wasteful number, since it uses less digits than its factorization.

77786256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1620558 (or 1620552 counting only the distinct ones).

The product of its digits is 987840, while the sum is 48.

The square root of 77786256 is about 8819.6516938029. The cubic root of 77786256 is about 426.8752311486.

The spelling of 77786256 in words is "seventy-seven million, seven hundred eighty-six thousand, two hundred fifty-six".