77989395 has 32 divisors (see below), whose sum is σ = 143297280. Its totient is φ = 35821440.

The previous prime is 77989393. The next prime is 77989427. The reversal of 77989395 is 59398977.

It is not a de Polignac number, because 77989395 - 2¹ = 77989393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

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 31 ways as a sum of consecutive naturals, for example, 9304 + ... + 15573.

It is an arithmetic number, because the mean of its divisors is an integer number (4478040).

Almost surely, 2^77989395 is an apocalyptic number.

77989395 is a deficient number, since it is larger than the sum of its proper divisors (65307885).

77989395 is a wasteful number, since it uses less digits than its factorization.

77989395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24915.

The product of its digits is 4286520, while the sum is 57.

The square root of 77989395 is about 8831.1604560216. The cubic root of 77989395 is about 427.2465033839.

The spelling of 77989395 in words is "seventy-seven million, nine hundred eighty-nine thousand, three hundred ninety-five".