311283640 has 32 divisors (see below), whose sum is σ = 703961280. Its totient is φ = 123878272.

The previous prime is 311283601. The next prime is 311283647. The reversal of 311283640 is 46382113.

It is a junction number, because it is equal to n+sod(n) for n = 311283599 and 311283608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311283647) 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, 11872 + ... + 27631.

It is an arithmetic number, because the mean of its divisors is an integer number (21998790).

Almost surely, 2^311283640 is an apocalyptic number.

It is an amenable number.

311283640 is an abundant number, since it is smaller than the sum of its proper divisors (392677640).

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

311283640 is a wasteful number, since it uses less digits than its factorization.

311283640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39711 (or 39707 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 311283640 is about 17643.2321301966. The cubic root of 311283640 is about 677.7228035876.

The spelling of 311283640 in words is "three hundred eleven million, two hundred eighty-three thousand, six hundred forty".