77989456 has 20 divisors (see below), whose sum is σ = 152927712. Its totient is φ = 38524256.

The previous prime is 77989441. The next prime is 77989463. The reversal of 77989456 is 65498977.

It is a junction number, because it is equal to n+sod(n) for n = 77989397 and 77989406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28036 + ... + 30691.

Almost surely, 2^77989456 is an apocalyptic number.

It is an amenable number.

77989456 is a deficient number, since it is larger than the sum of its proper divisors (74938256).

77989456 is a wasteful number, since it uses less digits than its factorization.

77989456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58818 (or 58812 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 55.

The square root of 77989456 is about 8831.1639097007. The cubic root of 77989456 is about 427.2466147752.

The spelling of 77989456 in words is "seventy-seven million, nine hundred eighty-nine thousand, four hundred fifty-six".