78828932391 has 64 divisors (see below), whose sum is σ = 124224399360. Its totient is φ = 43927869440.

The previous prime is 78828932353. The next prime is 78828932431. The reversal of 78828932391 is 19323982887.

It is not a de Polignac number, because 78828932391 - 2⁹ = 78828931879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78828932311) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7100641 + ... + 7111733.

It is an arithmetic number, because the mean of its divisors is an integer number (1941006240).

Almost surely, 2^78828932391 is an apocalyptic number.

78828932391 is a deficient number, since it is larger than the sum of its proper divisors (45395466969).

78828932391 is a wasteful number, since it uses less digits than its factorization.

78828932391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11416.

The product of its digits is 10450944, while the sum is 60.

The spelling of 78828932391 in words is "seventy-eight billion, eight hundred twenty-eight million, nine hundred thirty-two thousand, three hundred ninety-one".