311788278648 has 448 divisors, whose sum is σ = 1128085125120. Its totient is φ = 78368083200.

The previous prime is 311788278629. The next prime is 311788278709. The reversal of 311788278648 is 846872887113.

311788278648 is a `hidden beast` number, since 311 + 7 + 8 + 8 + 278 + 6 + 48 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 13909786 + ... + 13932182.

Almost surely, 2^311788278648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 311788278648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (564042562560).

311788278648 is an abundant number, since it is smaller than the sum of its proper divisors (816296846472).

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

311788278648 is a wasteful number, since it uses less digits than its factorization.

311788278648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22470 (or 22451 counting only the distinct ones).

The product of its digits is 28901376, while the sum is 63.

The spelling of 311788278648 in words is "three hundred eleven billion, seven hundred eighty-eight million, two hundred seventy-eight thousand, six hundred forty-eight".