77018789 has 12 divisors (see below), whose sum is σ = 85380384. Its totient is φ = 69330624.

The previous prime is 77018779. The next prime is 77018791. The reversal of 77018789 is 98781077.

It is a de Polignac number, because none of the positive numbers 2^k-77018789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77018729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 854 + ... + 12440.

It is an arithmetic number, because the mean of its divisors is an integer number (7115032).

Almost surely, 2^77018789 is an apocalyptic number.

It is an amenable number.

77018789 is a deficient number, since it is larger than the sum of its proper divisors (8361595).

77018789 is a wasteful number, since it uses less digits than its factorization.

77018789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11644 (or 11627 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 47.

The square root of 77018789 is about 8776.0349247254. The cubic root of 77018789 is about 425.4666873487.

The spelling of 77018789 in words is "seventy-seven million, eighteen thousand, seven hundred eighty-nine".