390742779820 has 48 divisors (see below), whose sum is σ = 836327268000. Its totient is φ = 153305600000.

The previous prime is 390742779809. The next prime is 390742779821. The reversal of 390742779820 is 28977247093.

It is not an unprimeable number, because it can be changed into a prime (390742779821) 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, 161070 + ... + 898570.

It is an arithmetic number, because the mean of its divisors is an integer number (17423484750).

Almost surely, 2^390742779820 is an apocalyptic number.

It is an amenable number.

390742779820 is an abundant number, since it is smaller than the sum of its proper divisors (445584488180).

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

390742779820 is a wasteful number, since it uses less digits than its factorization.

390742779820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738018 (or 738016 counting only the distinct ones).

The product of its (nonzero) digits is 10668672, while the sum is 58.

The spelling of 390742779820 in words is "three hundred ninety billion, seven hundred forty-two million, seven hundred seventy-nine thousand, eight hundred twenty".