15664390240 has 96 divisors (see below), whose sum is σ = 39404141280. Its totient is φ = 5864054784.

The previous prime is 15664390211. The next prime is 15664390289. The reversal of 15664390240 is 4209346651.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 15664390193 and 15664390202.

It is a congruent number.

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, 470794 + ... + 502966.

It is an arithmetic number, because the mean of its divisors is an integer number (410459805).

Almost surely, 2^15664390240 is an apocalyptic number.

15664390240 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 15664390240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19702070640).

15664390240 is an abundant number, since it is smaller than the sum of its proper divisors (23739751040).

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

15664390240 is a wasteful number, since it uses less digits than its factorization.

15664390240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32384 (or 32376 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 15664390240 in words is "fifteen billion, six hundred sixty-four million, three hundred ninety thousand, two hundred forty".