15780457980 has 216 divisors, whose sum is σ = 57738032352. Its totient is φ = 3417023232.

The previous prime is 15780457969. The next prime is 15780457981. The reversal of 15780457980 is 8975408751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15780457981) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 437514 + ... + 472206.

Almost surely, 2^15780457980 is an apocalyptic number.

15780457980 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 15780457980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28869016176).

15780457980 is an abundant number, since it is smaller than the sum of its proper divisors (41957574372).

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

15780457980 is a wasteful number, since it uses less digits than its factorization.

15780457980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34753 (or 34729 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 54.

The spelling of 15780457980 in words is "fifteen billion, seven hundred eighty million, four hundred fifty-seven thousand, nine hundred eighty".