15426631640 has 128 divisors (see below), whose sum is σ = 42160435200. Its totient is φ = 4959221760.

The previous prime is 15426631621. The next prime is 15426631663. The reversal of 15426631640 is 4613662451.

It is a junction number, because it is equal to n+sod(n) for n = 15426631594 and 15426631603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1283981 + ... + 1295939.

It is an arithmetic number, because the mean of its divisors is an integer number (329378400).

Almost surely, 2^15426631640 is an apocalyptic number.

15426631640 is a gapful number since it is divisible by the number (10) 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 15426631640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21080217600).

15426631640 is an abundant number, since it is smaller than the sum of its proper divisors (26733803560).

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

15426631640 is a wasteful number, since it uses less digits than its factorization.

15426631640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12265 (or 12261 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 15426631640 in words is "fifteen billion, four hundred twenty-six million, six hundred thirty-one thousand, six hundred forty".