77486868 has 42 divisors (see below), whose sum is σ = 203317674. Its totient is φ = 25827984.

The previous prime is 77486863. The next prime is 77486881. The reversal of 77486868 is 86868477.

It can be written as a sum of positive squares in only one way, i.e., 77475204 + 11664 = 8802^2 + 108^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77486863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 10371 + ... + 16202.

It is an arithmetic number, because the mean of its divisors is an integer number (4840897).

Almost surely, 2^77486868 is an apocalyptic number.

It is an amenable number.

77486868 is an abundant number, since it is smaller than the sum of its proper divisors (125830806).

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

77486868 is a wasteful number, since it uses less digits than its factorization.

77486868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26595 (or 26578 counting only the distinct ones).

The product of its digits is 3612672, while the sum is 54.

The square root of 77486868 is about 8802.6625517510. The cubic root of 77486868 is about 426.3268667687.

The spelling of 77486868 in words is "seventy-seven million, four hundred eighty-six thousand, eight hundred sixty-eight".