15828561780 has 24 divisors (see below), whose sum is σ = 44319973152. Its totient is φ = 4220949792.

The previous prime is 15828561761. The next prime is 15828561787. The reversal of 15828561780 is 8716582851.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15828561787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131904622 + ... + 131904741.

It is an arithmetic number, because the mean of its divisors is an integer number (1846665548).

Almost surely, 2^15828561780 is an apocalyptic number.

15828561780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15828561780 is an abundant number, since it is smaller than the sum of its proper divisors (28491411372).

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

15828561780 is a wasteful number, since it uses less digits than its factorization.

15828561780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263809375 (or 263809373 counting only the distinct ones).

The product of its (nonzero) digits is 1075200, while the sum is 51.

The spelling of 15828561780 in words is "fifteen billion, eight hundred twenty-eight million, five hundred sixty-one thousand, seven hundred eighty".