15638542080 has 432 divisors, whose sum is σ = 61530204960. Its totient is φ = 3363569664.

The previous prime is 15638542079. The next prime is 15638542141. The reversal of 15638542080 is 8024583651.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3196276 + ... + 3201164.

It is an arithmetic number, because the mean of its divisors is an integer number (142431030).

Almost surely, 2^15638542080 is an apocalyptic number.

15638542080 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 15638542080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30765102480).

15638542080 is an abundant number, since it is smaller than the sum of its proper divisors (45891662880).

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

15638542080 is a wasteful number, since it uses less digits than its factorization.

15638542080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4944 (or 4923 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 42.

The spelling of 15638542080 in words is "fifteen billion, six hundred thirty-eight million, five hundred forty-two thousand, eighty".