77989394 has 16 divisors (see below), whose sum is σ = 136219968. Its totient is φ = 32793072.

The previous prime is 77989393. The next prime is 77989427. The reversal of 77989394 is 49398977.

It is not an unprimeable number, because it can be changed into a prime (77989393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51812 + ... + 53295.

It is an arithmetic number, because the mean of its divisors is an integer number (8513748).

Almost surely, 2^77989394 is an apocalyptic number.

77989394 is a deficient number, since it is larger than the sum of its proper divisors (58230574).

77989394 is a wasteful number, since it uses less digits than its factorization.

77989394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105169.

The product of its digits is 3429216, while the sum is 56.

The square root of 77989394 is about 8831.1603994039. The cubic root of 77989394 is about 427.2465015578.

The spelling of 77989394 in words is "seventy-seven million, nine hundred eighty-nine thousand, three hundred ninety-four".