78298390825 has 12 divisors (see below), whose sum is σ = 99714059980. Its totient is φ = 60945773760.

The previous prime is 78298390801. The next prime is 78298390853. The reversal of 78298390825 is 52809389287.

It can be written as a sum of positive squares in 6 ways, for example, as 11709620521 + 66588770304 = 108211^2 + 258048^2 .

It is not a de Polignac number, because 78298390825 - 2²⁵ = 78264836393 is a prime.

It is a super-2 number, since 2×78298390825² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (61) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42322530 + ... + 42324379.

Almost surely, 2^78298390825 is an apocalyptic number.

It is an amenable number.

78298390825 is a deficient number, since it is larger than the sum of its proper divisors (21415669155).

78298390825 is a wasteful number, since it uses less digits than its factorization.

78298390825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84646956 (or 84646951 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 61.

The spelling of 78298390825 in words is "seventy-eight billion, two hundred ninety-eight million, three hundred ninety thousand, eight hundred twenty-five".