78628653 has 12 divisors (see below), whose sum is σ = 113904700. Its totient is φ = 52266816.

The previous prime is 78628643. The next prime is 78628661. The reversal of 78628653 is 35682687.

It can be written as a sum of positive squares in 2 ways, for example, as 30437289 + 48191364 = 5517^2 + 6942^2 .

It is not a de Polignac number, because 78628653 - 2¹⁰ = 78627629 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78628599 and 78628608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78628643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9376 + ... + 15657.

Almost surely, 2^78628653 is an apocalyptic number.

It is an amenable number.

78628653 is a deficient number, since it is larger than the sum of its proper divisors (35276047).

78628653 is a wasteful number, since it uses less digits than its factorization.

78628653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25388 (or 25385 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 78628653 is about 8867.2799098709. The cubic root of 78628653 is about 428.4106697539.

The spelling of 78628653 in words is "seventy-eight million, six hundred twenty-eight thousand, six hundred fifty-three".