77728364 has 12 divisors (see below), whose sum is σ = 155456784. Its totient is φ = 33312144.

The previous prime is 77728363. The next prime is 77728393. The reversal of 77728364 is 46382777.

77728364 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (77728361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1387979 + ... + 1388034.

It is an arithmetic number, because the mean of its divisors is an integer number (12954732).

Almost surely, 2^77728364 is an apocalyptic number.

It is an amenable number.

77728364 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

77728364 is a wasteful number, since it uses less digits than its factorization.

77728364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2776024 (or 2776022 counting only the distinct ones).

The product of its digits is 395136, while the sum is 44.

The square root of 77728364 is about 8816.3690939071. The cubic root of 77728364 is about 426.7693050058.

The spelling of 77728364 in words is "seventy-seven million, seven hundred twenty-eight thousand, three hundred sixty-four".