77745969 has 12 divisors (see below), whose sum is σ = 128342656. Its totient is φ = 44426232.

The previous prime is 77745959. The next prime is 77745973. The reversal of 77745969 is 96954777.

It is a happy number.

It is not a de Polignac number, because 77745969 - 2⁴ = 77745953 is a prime.

It is a super-2 number, since 2×77745969² = 12088871391497922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77745959) 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, 616969 + ... + 617094.

Almost surely, 2^77745969 is an apocalyptic number.

It is an amenable number.

77745969 is a deficient number, since it is larger than the sum of its proper divisors (50596687).

77745969 is a wasteful number, since it uses less digits than its factorization.

77745969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1234076 (or 1234073 counting only the distinct ones).

The product of its digits is 3333960, while the sum is 54.

The square root of 77745969 is about 8817.3674642719. The cubic root of 77745969 is about 426.8015227878.

The spelling of 77745969 in words is "seventy-seven million, seven hundred forty-five thousand, nine hundred sixty-nine".