312499999920 has 160 divisors (see below), whose sum is σ = 984343497984. Its totient is φ = 82000000000.

The previous prime is 312499999919. The next prime is 312500000027. The reversal of 312499999920 is 29999994213.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4968670 + ... + 5031170.

Almost surely, 2^312499999920 is an apocalyptic number.

312499999920 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 312499999920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (492171748992).

312499999920 is an abundant number, since it is smaller than the sum of its proper divisors (671843498064).

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

312499999920 is a wasteful number, since it uses less digits than its factorization.

312499999920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62851 (or 62845 counting only the distinct ones).

The product of its (nonzero) digits is 25509168, while the sum is 66.

The spelling of 312499999920 in words is "three hundred twelve billion, four hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred twenty".