15078531840 has 144 divisors (see below), whose sum is σ = 48222440448. Its totient is φ = 4015484928.

The previous prime is 15078531827. The next prime is 15078531859. The reversal of 15078531840 is 4813587051.

It is a junction number, because it is equal to n+sod(n) for n = 15078531792 and 15078531801.

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, 3388497 + ... + 3392943.

Almost surely, 2^15078531840 is an apocalyptic number.

15078531840 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 15078531840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24111220224).

15078531840 is an abundant number, since it is smaller than the sum of its proper divisors (33143908608).

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

15078531840 is an equidigital number, since it uses as much as digits as its factorization.

15078531840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5354 (or 5340 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 42.

The spelling of 15078531840 in words is "fifteen billion, seventy-eight million, five hundred thirty-one thousand, eight hundred forty".