77285856 has 24 divisors (see below), whose sum is σ = 202875624. Its totient is φ = 25761920.

The previous prime is 77285839. The next prime is 77285869. The reversal of 77285856 is 65858277.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 402435 + ... + 402626.

It is an arithmetic number, because the mean of its divisors is an integer number (8453151).

Almost surely, 2^77285856 is an apocalyptic number.

It is an amenable number.

77285856 is an abundant number, since it is smaller than the sum of its proper divisors (125589768).

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

77285856 is a wasteful number, since it uses less digits than its factorization.

77285856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805074 (or 805066 counting only the distinct ones).

The product of its digits is 940800, while the sum is 48.

The square root of 77285856 is about 8791.2374555577. The cubic root of 77285856 is about 425.9578966081.

The spelling of 77285856 in words is "seventy-seven million, two hundred eighty-five thousand, eight hundred fifty-six".