77944388 has 24 divisors (see below), whose sum is σ = 145401984. Its totient is φ = 36432000.

The previous prime is 77944381. The next prime is 77944417. The reversal of 77944388 is 88344977.

It is not an unprimeable number, because it can be changed into a prime (77944381) 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 7 ways as a sum of consecutive naturals, for example, 6473 + ... + 14063.

It is an arithmetic number, because the mean of its divisors is an integer number (6058416).

Almost surely, 2^77944388 is an apocalyptic number.

It is an amenable number.

77944388 is a deficient number, since it is larger than the sum of its proper divisors (67457596).

77944388 is a wasteful number, since it uses less digits than its factorization.

77944388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7763 (or 7761 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 50.

The square root of 77944388 is about 8828.6118954227. The cubic root of 77944388 is about 427.1643008248.

The spelling of 77944388 in words is "seventy-seven million, nine hundred forty-four thousand, three hundred eighty-eight".