77697745 has 8 divisors (see below), whose sum is σ = 98144640. Its totient is φ = 58886640.

The previous prime is 77697733. The next prime is 77697751. The reversal of 77697745 is 54779677.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77697745 - 2⁹ = 77697233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77697692 and 77697701.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 408841 + ... + 409030.

It is an arithmetic number, because the mean of its divisors is an integer number (12268080).

Almost surely, 2^77697745 is an apocalyptic number.

It is an amenable number.

77697745 is a deficient number, since it is larger than the sum of its proper divisors (20446895).

77697745 is a wasteful number, since it uses less digits than its factorization.

77697745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817895.

The product of its digits is 2593080, while the sum is 52.

The square root of 77697745 is about 8814.6324370333. The cubic root of 77697745 is about 426.7132595467.

The spelling of 77697745 in words is "seventy-seven million, six hundred ninety-seven thousand, seven hundred forty-five".