7998243264 has 420 divisors, whose sum is σ = 26782099344. Its totient is φ = 2356992000.

The previous prime is 7998243247. The next prime is 7998243271. The reversal of 7998243264 is 4623428997.

7998243264 is a `hidden beast` number, since 79 + 9 + 82 + 432 + 64 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 7998243264.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 25717669 + ... + 25717979.

Almost surely, 2^7998243264 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 7998243264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13391049672).

7998243264 is an abundant number, since it is smaller than the sum of its proper divisors (18783856080).

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

7998243264 is a wasteful number, since it uses less digits than its factorization.

7998243264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398 (or 368 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 54.

The square root of 7998243264 is about 89432.8981080229. The cubic root of 7998243264 is about 1999.8535946163.

The spelling of 7998243264 in words is "seven billion, nine hundred ninety-eight million, two hundred forty-three thousand, two hundred sixty-four".