77924989 has 4 divisors (see below), whose sum is σ = 81313056. Its totient is φ = 74536924.

The previous prime is 77924983. The next prime is 77924993. The reversal of 77924989 is 98942977.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77924989 - 2³ = 77924981 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 (77924981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1693999 + ... + 1694044.

It is an arithmetic number, because the mean of its divisors is an integer number (20328264).

Almost surely, 2^77924989 is an apocalyptic number.

It is an amenable number.

77924989 is a deficient number, since it is larger than the sum of its proper divisors (3388067).

77924989 is a wasteful number, since it uses less digits than its factorization.

77924989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3388066.

The product of its digits is 2286144, while the sum is 55.

The square root of 77924989 is about 8827.5131832244. The cubic root of 77924989 is about 427.1288599674.

The spelling of 77924989 in words is "seventy-seven million, nine hundred twenty-four thousand, nine hundred eighty-nine".