15278661580 has 144 divisors (see below), whose sum is σ = 40681720800. Its totient is φ = 4776855552.

The previous prime is 15278661569. The next prime is 15278661641. The reversal of 15278661580 is 8516687251.

It is a Harshad number since it is a multiple of its sum of digits (49).

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, 1050196 + ... + 1064644.

It is an arithmetic number, because the mean of its divisors is an integer number (282511950).

Almost surely, 2^15278661580 is an apocalyptic number.

15278661580 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 15278661580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20340860400).

15278661580 is an abundant number, since it is smaller than the sum of its proper divisors (25403059220).

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

15278661580 is a wasteful number, since it uses less digits than its factorization.

15278661580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14568 (or 14559 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 49.

The spelling of 15278661580 in words is "fifteen billion, two hundred seventy-eight million, six hundred sixty-one thousand, five hundred eighty".