15228891648 has 140 divisors (see below), whose sum is σ = 45622307478. Its totient is φ = 5076172800.

The previous prime is 15228891631. The next prime is 15228891659. The reversal of 15228891648 is 84619882251.

It can be written as a sum of positive squares in only one way, i.e., 9114902784 + 6113988864 = 95472^2 + 78192^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 15228891594 and 15228891603.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 352848 + ... + 393648.

Almost surely, 2^15228891648 is an apocalyptic number.

15228891648 is a gapful number since it is divisible by the number (18) 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 15228891648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22811153739).

15228891648 is an abundant number, since it is smaller than the sum of its proper divisors (30393415830).

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

15228891648 is an frugal number, since it uses more digits than its factorization.

15228891648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40837 (or 40806 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 54.

The spelling of 15228891648 in words is "fifteen billion, two hundred twenty-eight million, eight hundred ninety-one thousand, six hundred forty-eight".