78992745 has 16 divisors (see below), whose sum is σ = 136110912. Its totient is φ = 38888640.

The previous prime is 78992731. The next prime is 78992779. The reversal of 78992745 is 54729987.

78992745 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 78992745 - 2⁴ = 78992729 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202351 + ... + 202740.

It is an arithmetic number, because the mean of its divisors is an integer number (8506932).

Almost surely, 2^78992745 is an apocalyptic number.

It is an amenable number.

78992745 is a deficient number, since it is larger than the sum of its proper divisors (57118167).

78992745 is a wasteful number, since it uses less digits than its factorization.

78992745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405112.

The product of its digits is 1270080, while the sum is 51.

The square root of 78992745 is about 8887.7862823090. The cubic root of 78992745 is about 429.0709072595.

The spelling of 78992745 in words is "seventy-eight million, nine hundred ninety-two thousand, seven hundred forty-five".