78457745 has 16 divisors (see below), whose sum is σ = 102305280. Its totient is φ = 57542400.

The previous prime is 78457739. The next prime is 78457837. The reversal of 78457745 is 54775487.

It is a happy number.

It is not a de Polignac number, because 78457745 - 2⁶ = 78457681 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78457745.

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, 10376 + ... + 16265.

It is an arithmetic number, because the mean of its divisors is an integer number (6394080).

Almost surely, 2^78457745 is an apocalyptic number.

It is an amenable number.

78457745 is a deficient number, since it is larger than the sum of its proper divisors (23847535).

78457745 is a wasteful number, since it uses less digits than its factorization.

78457745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26696.

The product of its digits is 1097600, while the sum is 47.

The square root of 78457745 is about 8857.6376647501. The cubic root of 78457745 is about 428.1000453958.

The spelling of 78457745 in words is "seventy-eight million, four hundred fifty-seven thousand, seven hundred forty-five".