77938144 has 12 divisors (see below), whose sum is σ = 153440784. Its totient is φ = 38969056.

The previous prime is 77938141. The next prime is 77938153. The reversal of 77938144 is 44183977.

It is a self number, because there is not a number n which added to its sum of digits gives 77938144.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77938141) 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 as a sum of consecutive naturals, namely, 1217752 + ... + 1217815.

It is an arithmetic number, because the mean of its divisors is an integer number (12786732).

Almost surely, 2^77938144 is an apocalyptic number.

It is an amenable number.

77938144 is a deficient number, since it is larger than the sum of its proper divisors (75502640).

77938144 is a wasteful number, since it uses less digits than its factorization.

77938144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2435577 (or 2435569 counting only the distinct ones).

The product of its digits is 169344, while the sum is 43.

The square root of 77938144 is about 8828.2582653658. The cubic root of 77938144 is about 427.1528940377.

The spelling of 77938144 in words is "seventy-seven million, nine hundred thirty-eight thousand, one hundred forty-four".