78309353625 has 32 divisors (see below), whose sum is σ = 130464846720. Its totient is φ = 41714321600.

The previous prime is 78309353621. The next prime is 78309353657. The reversal of 78309353625 is 52635390387.

It is not a de Polignac number, because 78309353625 - 2² = 78309353621 is a prime.

It is a super-2 number, since 2×78309353625² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78309353621) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 183871 + ... + 436379.

It is an arithmetic number, because the mean of its divisors is an integer number (4077026460).

Almost surely, 2^78309353625 is an apocalyptic number.

78309353625 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78309353625 is a deficient number, since it is larger than the sum of its proper divisors (52155493095).

78309353625 is a wasteful number, since it uses less digits than its factorization.

78309353625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253354 (or 253344 counting only the distinct ones).

The product of its (nonzero) digits is 4082400, while the sum is 51.

The spelling of 78309353625 in words is "seventy-eight billion, three hundred nine million, three hundred fifty-three thousand, six hundred twenty-five".