15491426944 has 128 divisors (see below), whose sum is σ = 36991238400. Its totient is φ = 6321659904.

The previous prime is 15491426941. The next prime is 15491426971. The reversal of 15491426944 is 44962419451.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×15491426944² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15491426941) 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, 1892749 + ... + 1900915.

It is an arithmetic number, because the mean of its divisors is an integer number (288994050).

Almost surely, 2^15491426944 is an apocalyptic number.

15491426944 is a gapful number since it is divisible by the number (14) 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 15491426944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18495619200).

15491426944 is an abundant number, since it is smaller than the sum of its proper divisors (21499811456).

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

15491426944 is an equidigital number, since it uses as much as digits as its factorization.

15491426944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8290 (or 8278 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 49.

The spelling of 15491426944 in words is "fifteen billion, four hundred ninety-one million, four hundred twenty-six thousand, nine hundred forty-four".