15875640440 has 96 divisors (see below), whose sum is σ = 39418550640. Its totient is φ = 5750046720.

The previous prime is 15875640427. The next prime is 15875640457. The reversal of 15875640440 is 4404657851.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 15875640391 and 15875640400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1237499 + ... + 1250261.

Almost surely, 2^15875640440 is an apocalyptic number.

15875640440 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 15875640440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19709275320).

15875640440 is an abundant number, since it is smaller than the sum of its proper divisors (23542910200).

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

15875640440 is a wasteful number, since it uses less digits than its factorization.

15875640440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13053 (or 13038 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 44.

The spelling of 15875640440 in words is "fifteen billion, eight hundred seventy-five million, six hundred forty thousand, four hundred forty".