312229728 has 72 divisors (see below), whose sum is σ = 920811528. Its totient is φ = 104073984.

The previous prime is 312229727. The next prime is 312229733. The reversal of 312229728 is 827922213.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 312229692 and 312229701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312229727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12301 + ... + 27852.

It is an arithmetic number, because the mean of its divisors is an integer number (12789049).

Almost surely, 2^312229728 is an apocalyptic number.

It is an amenable number.

312229728 is an abundant number, since it is smaller than the sum of its proper divisors (608581800).

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

312229728 is an equidigital number, since it uses as much as digits as its factorization.

312229728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40178 (or 40158 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 312229728 is about 17670.0234295261. The cubic root of 312229728 is about 678.4087127678.

The spelling of 312229728 in words is "three hundred twelve million, two hundred twenty-nine thousand, seven hundred twenty-eight".