311234640 has 80 divisors (see below), whose sum is σ = 1021595328. Its totient is φ = 78112768.

The previous prime is 311234629. The next prime is 311234663. The reversal of 311234640 is 46432113.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×311234640² = 193734002271859200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 311234640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34062 + ... + 42221.

Almost surely, 2^311234640 is an apocalyptic number.

311234640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

311234640 is an abundant number, since it is smaller than the sum of its proper divisors (710360688).

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

311234640 is a wasteful number, since it uses less digits than its factorization.

311234640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76316 (or 76310 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 311234640 is about 17641.8434410920. The cubic root of 311234640 is about 677.6872409948.

Adding to 311234640 its reverse (46432113), we get a palindrome (357666753).

The spelling of 311234640 in words is "three hundred eleven million, two hundred thirty-four thousand, six hundred forty".