391791362028 has 48 divisors (see below), whose sum is σ = 1000246525824. Its totient is φ = 118372343040.

The previous prime is 391791362021. The next prime is 391791362063. The reversal of 391791362028 is 820263197193.

It is not an unprimeable number, because it can be changed into a prime (391791362021) 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, 4359250 + ... + 4448217.

It is an arithmetic number, because the mean of its divisors is an integer number (20838469288).

Almost surely, 2^391791362028 is an apocalyptic number.

It is an amenable number.

391791362028 is an abundant number, since it is smaller than the sum of its proper divisors (608455163796).

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

391791362028 is a wasteful number, since it uses less digits than its factorization.

391791362028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8807822 (or 8807820 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 51.

The spelling of 391791362028 in words is "three hundred ninety-one billion, seven hundred ninety-one million, three hundred sixty-two thousand, twenty-eight".