7538646864 has 120 divisors (see below), whose sum is σ = 22724015808. Its totient is φ = 2147281920.

The previous prime is 7538646859. The next prime is 7538646877. The reversal of 7538646864 is 4686468357.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 787869 + ... + 797379.

Almost surely, 2^7538646864 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 7538646864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11362007904).

7538646864 is an abundant number, since it is smaller than the sum of its proper divisors (15185368944).

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

7538646864 is a wasteful number, since it uses less digits than its factorization.

7538646864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9873 (or 9860 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 57.

The square root of 7538646864 is about 86825.3814503570. The cubic root of 7538646864 is about 1960.7902255746.

The spelling of 7538646864 in words is "seven billion, five hundred thirty-eight million, six hundred forty-six thousand, eight hundred sixty-four".