15857296640 has 144 divisors (see below), whose sum is σ = 41722128000. Its totient is φ = 5747613696.

The previous prime is 15857296613. The next prime is 15857296649. The reversal of 15857296640 is 4669275851.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15857296649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 545186 + ... + 573534.

It is an arithmetic number, because the mean of its divisors is an integer number (289737000).

Almost surely, 2^15857296640 is an apocalyptic number.

15857296640 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 15857296640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20861064000).

15857296640 is an abundant number, since it is smaller than the sum of its proper divisors (25864831360).

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

15857296640 is a wasteful number, since it uses less digits than its factorization.

15857296640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28412 (or 28398 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 53.

The spelling of 15857296640 in words is "fifteen billion, eight hundred fifty-seven million, two hundred ninety-six thousand, six hundred forty".