77488139 has 4 divisors (see below), whose sum is σ = 77696256. Its totient is φ = 77280024.

The previous prime is 77488133. The next prime is 77488141. The reversal of 77488139 is 93188477.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77488139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77488093 and 77488102.

It is not an unprimeable number, because it can be changed into a prime (77488133) 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 3 ways as a sum of consecutive naturals, for example, 103499 + ... + 104244.

It is an arithmetic number, because the mean of its divisors is an integer number (19424064).

Almost surely, 2^77488139 is an apocalyptic number.

77488139 is a deficient number, since it is larger than the sum of its proper divisors (208117).

77488139 is a wasteful number, since it uses less digits than its factorization.

77488139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208116.

The product of its digits is 338688, while the sum is 47.

The square root of 77488139 is about 8802.7347455208. The cubic root of 77488139 is about 426.3291977378.

The spelling of 77488139 in words is "seventy-seven million, four hundred eighty-eight thousand, one hundred thirty-nine".