78440745 has 16 divisors (see below), whose sum is σ = 125856000. Its totient is φ = 41718144.

The previous prime is 78440701. The next prime is 78440753. The reversal of 78440745 is 54704487.

It is not a de Polignac number, because 78440745 - 2⁸ = 78440489 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1620 + ... + 12629.

It is an arithmetic number, because the mean of its divisors is an integer number (7866000).

Almost surely, 2^78440745 is an apocalyptic number.

It is an amenable number.

78440745 is a deficient number, since it is larger than the sum of its proper divisors (47415255).

78440745 is a wasteful number, since it uses less digits than its factorization.

78440745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14624.

The product of its (nonzero) digits is 125440, while the sum is 39.

The square root of 78440745 is about 8856.6779889527. The cubic root of 78440745 is about 428.0691233308.

The spelling of 78440745 in words is "seventy-eight million, four hundred forty thousand, seven hundred forty-five".