78628745 has 16 divisors (see below), whose sum is σ = 106962240. Its totient is φ = 55007424.

The previous prime is 78628729. The next prime is 78628763. The reversal of 78628745 is 54782687.

It is a cyclic number.

It is not a de Polignac number, because 78628745 - 2⁴ = 78628729 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78628745.

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, 30599 + ... + 33068.

It is an arithmetic number, because the mean of its divisors is an integer number (6685140).

Almost surely, 2^78628745 is an apocalyptic number.

It is an amenable number.

78628745 is a deficient number, since it is larger than the sum of its proper divisors (28333495).

78628745 is a wasteful number, since it uses less digits than its factorization.

78628745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63704.

The product of its digits is 752640, while the sum is 47.

The square root of 78628745 is about 8867.2850974805. The cubic root of 78628745 is about 428.4108368421.

The spelling of 78628745 in words is "seventy-eight million, six hundred twenty-eight thousand, seven hundred forty-five".