15449382720 has 280 divisors, whose sum is σ = 55104709704. Its totient is φ = 4108713984.

The previous prime is 15449382719. The next prime is 15449382731. The reversal of 15449382720 is 2728394451.

15449382720 is a `hidden beast` number, since 1 + 544 + 9 + 3 + 82 + 7 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 10541539584 + 4907843136 = 102672^2 + 70056^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 14955324 + ... + 14956356.

Almost surely, 2^15449382720 is an apocalyptic number.

15449382720 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 15449382720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27552354852).

15449382720 is an abundant number, since it is smaller than the sum of its proper divisors (39655326984).

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

15449382720 is a wasteful number, since it uses less digits than its factorization.

15449382720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1639 (or 1620 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 15449382720 in words is "fifteen billion, four hundred forty-nine million, three hundred eighty-two thousand, seven hundred twenty".