78385357902 has 32 divisors (see below), whose sum is σ = 166041231264. Its totient is φ = 24584268800.

The previous prime is 78385357819. The next prime is 78385357909. The reversal of 78385357902 is 20975358387.

It is a happy number.

It is a super-2 number, since 2×78385357902² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78385357909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 242002 + ... + 464042.

It is an arithmetic number, because the mean of its divisors is an integer number (5188788477).

Almost surely, 2^78385357902 is an apocalyptic number.

78385357902 is an abundant number, since it is smaller than the sum of its proper divisors (87655873362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78385357902 is a wasteful number, since it uses less digits than its factorization.

78385357902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225524.

The product of its (nonzero) digits is 12700800, while the sum is 57.

The spelling of 78385357902 in words is "seventy-eight billion, three hundred eighty-five million, three hundred fifty-seven thousand, nine hundred two".