2391755664 has 80 divisors (see below), whose sum is σ = 6354843264. Its totient is φ = 774681600.

The previous prime is 2391755659. The next prime is 2391755683. The reversal of 2391755664 is 4665571932.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 515274 + ... + 519894.

Almost surely, 2^2391755664 is an apocalyptic number.

2391755664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2391755664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3177421632).

2391755664 is an abundant number, since it is smaller than the sum of its proper divisors (3963087600).

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

2391755664 is a wasteful number, since it uses less digits than its factorization.

2391755664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4936 (or 4930 counting only the distinct ones).

The product of its digits is 1360800, while the sum is 48.

The square root of 2391755664 is about 48905.5790682413. The cubic root of 2391755664 is about 1337.3310774407.

The spelling of 2391755664 in words is "two billion, three hundred ninety-one million, seven hundred fifty-five thousand, six hundred sixty-four".