15440636240 has 80 divisors (see below), whose sum is σ = 39237488640. Its totient is φ = 5625415680.

The previous prime is 15440636171. The next prime is 15440636243. The reversal of 15440636240 is 4263604451.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 15440636240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15440636243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140960 + ... + 225279.

It is an arithmetic number, because the mean of its divisors is an integer number (490468608).

Almost surely, 2^15440636240 is an apocalyptic number.

15440636240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15440636240 is an abundant number, since it is smaller than the sum of its proper divisors (23796852400).

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

15440636240 is a wasteful number, since it uses less digits than its factorization.

15440636240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366300 (or 366294 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 35.

The spelling of 15440636240 in words is "fifteen billion, four hundred forty million, six hundred thirty-six thousand, two hundred forty".