11638614728 has 64 divisors (see below), whose sum is σ = 23919462000. Its totient is φ = 5276823552.

The previous prime is 11638614683. The next prime is 11638614731. The reversal of 11638614728 is 82741683611.

It can be written as a sum of positive squares in 8 ways, for example, as 1698923524 + 9939691204 = 41218^2 + 99698^2 .

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, 1449188 + ... + 1457196.

Almost surely, 2^11638614728 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 11638614728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11959731000).

11638614728 is an abundant number, since it is smaller than the sum of its proper divisors (12280847272).

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

11638614728 is a wasteful number, since it uses less digits than its factorization.

11638614728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8274 (or 8270 counting only the distinct ones).

The product of its digits is 387072, while the sum is 47.

The spelling of 11638614728 in words is "eleven billion, six hundred thirty-eight million, six hundred fourteen thousand, seven hundred twenty-eight".