312643021540 has 24 divisors (see below), whose sum is σ = 659849601600. Its totient is φ = 124428778848.

The previous prime is 312643021513. The next prime is 312643021543. The reversal of 312643021540 is 45120346213.

It is not an unprimeable number, because it can be changed into a prime (312643021543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39272782 + ... + 39280741.

It is an arithmetic number, because the mean of its divisors is an integer number (27493733400).

Almost surely, 2^312643021540 is an apocalyptic number.

It is an amenable number.

312643021540 is an abundant number, since it is smaller than the sum of its proper divisors (347206580060).

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

312643021540 is a wasteful number, since it uses less digits than its factorization.

312643021540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78553731 (or 78553729 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 312643021540 its reverse (45120346213), we get a palindrome (357763367753).

The spelling of 312643021540 in words is "three hundred twelve billion, six hundred forty-three million, twenty-one thousand, five hundred forty".