77139899 has 4 divisors (see below), whose sum is σ = 77276040. Its totient is φ = 77003760.

The previous prime is 77139889. The next prime is 77139917. The reversal of 77139899 is 99893177.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99893177 = 1423 ⋅70199.

It is a cyclic number.

It is not a de Polignac number, because 77139899 - 2⁴ = 77139883 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77139899.

It is not an unprimeable number, because it can be changed into a prime (77139809) 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, 67217 + ... + 68354.

It is an arithmetic number, because the mean of its divisors is an integer number (19319010).

Almost surely, 2^77139899 is an apocalyptic number.

77139899 is a deficient number, since it is larger than the sum of its proper divisors (136141).

77139899 is a wasteful number, since it uses less digits than its factorization.

77139899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136140.

The product of its digits is 857304, while the sum is 53.

The square root of 77139899 is about 8782.9322552323. The cubic root of 77139899 is about 425.6895822457.

The spelling of 77139899 in words is "seventy-seven million, one hundred thirty-nine thousand, eight hundred ninety-nine".