15538942480 has 80 divisors (see below), whose sum is σ = 38349960624. Its totient is φ = 5835161600.

The previous prime is 15538942453. The next prime is 15538942493. The reversal of 15538942480 is 8424983551.

It can be written as a sum of positive squares in 8 ways, for example, as 2772654336 + 12766288144 = 52656^2 + 112988^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 531114 + ... + 559606.

Almost surely, 2^15538942480 is an apocalyptic number.

15538942480 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 15538942480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19174980312).

15538942480 is an abundant number, since it is smaller than the sum of its proper divisors (22811018144).

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

15538942480 is a wasteful number, since it uses less digits than its factorization.

15538942480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28924 (or 28918 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 49.

The spelling of 15538942480 in words is "fifteen billion, five hundred thirty-eight million, nine hundred forty-two thousand, four hundred eighty".