312147280 has 20 divisors (see below), whose sum is σ = 725742612. Its totient is φ = 124858880.

The previous prime is 312147223. The next prime is 312147287. The reversal of 312147280 is 82741213.

It can be written as a sum of positive squares in 2 ways, for example, as 183006784 + 129140496 = 13528^2 + 11364^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×312147280² = 194871848822796800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312147287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1950841 + ... + 1951000.

Almost surely, 2^312147280 is an apocalyptic number.

It is an amenable number.

312147280 is an abundant number, since it is smaller than the sum of its proper divisors (413595332).

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

312147280 is a wasteful number, since it uses less digits than its factorization.

312147280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3901854 (or 3901848 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 312147280 is about 17667.6902848109. The cubic root of 312147280 is about 678.3489935285.

Adding to 312147280 its reverse (82741213), we get a palindrome (394888493).

The spelling of 312147280 in words is "three hundred twelve million, one hundred forty-seven thousand, two hundred eighty".