312225500 has 24 divisors (see below), whose sum is σ = 681901584. Its totient is φ = 124890000.

The previous prime is 312225493. The next prime is 312225509. The reversal of 312225500 is 5522213.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312225509) 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, 311726 + ... + 312725.

It is an arithmetic number, because the mean of its divisors is an integer number (28412566).

Almost surely, 2^312225500 is an apocalyptic number.

It is an amenable number.

312225500 is an abundant number, since it is smaller than the sum of its proper divisors (369676084).

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

312225500 is a wasteful number, since it uses less digits than its factorization.

312225500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624470 (or 624458 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 312225500 is about 17669.9037914755. The cubic root of 312225500 is about 678.4056505728.

Adding to 312225500 its reverse (5522213), we get a palindrome (317747713).

The spelling of 312225500 in words is "three hundred twelve million, two hundred twenty-five thousand, five hundred".