77428844 has 12 divisors (see below), whose sum is σ = 135912168. Its totient is φ = 38596800.

The previous prime is 77428831. The next prime is 77428847. The reversal of 77428844 is 44882477.

It is a junction number, because it is equal to n+sod(n) for n = 77428795 and 77428804.

It is not an unprimeable number, because it can be changed into a prime (77428847) 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, 27917 + ... + 30564.

It is an arithmetic number, because the mean of its divisors is an integer number (11326014).

Almost surely, 2^77428844 is an apocalyptic number.

It is an amenable number.

77428844 is a deficient number, since it is larger than the sum of its proper divisors (58483324).

77428844 is a wasteful number, since it uses less digits than its factorization.

77428844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58816 (or 58814 counting only the distinct ones).

The product of its digits is 401408, while the sum is 44.

The square root of 77428844 is about 8799.3661135334. The cubic root of 77428844 is about 426.2204256477.

The spelling of 77428844 in words is "seventy-seven million, four hundred twenty-eight thousand, eight hundred forty-four".