78009280925 has 18 divisors (see below), whose sum is σ = 98569477422. Its totient is φ = 61221946240.

The previous prime is 78009280919. The next prime is 78009280939. The reversal of 78009280925 is 52908290087.

It can be written as a sum of positive squares in 9 ways, for example, as 6188496889 + 71820784036 = 78667^2 + 267994^2 .

It is a de Polignac number, because none of the positive numbers 2^k-78009280925 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 10162889 + ... + 10170561.

It is an arithmetic number, because the mean of its divisors is an integer number (5476082079).

Almost surely, 2^78009280925 is an apocalyptic number.

It is an amenable number.

78009280925 is a deficient number, since it is larger than the sum of its proper divisors (20560196497).

78009280925 is an frugal number, since it uses more digits than its factorization.

78009280925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15409 (or 7731 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 50.

The spelling of 78009280925 in words is "seventy-eight billion, nine million, two hundred eighty thousand, nine hundred twenty-five".