19780061280 has 144 divisors (see below), whose sum is σ = 72479882160. Its totient is φ = 4521151488.

The previous prime is 19780061267. The next prime is 19780061281. The reversal of 19780061280 is 8216008791.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19780061281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 396975 + ... + 444014.

It is an arithmetic number, because the mean of its divisors is an integer number (503332515).

Almost surely, 2^19780061280 is an apocalyptic number.

19780061280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19780061280 is an abundant number, since it is smaller than the sum of its proper divisors (52699820880).

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

19780061280 is a wasteful number, since it uses less digits than its factorization.

19780061280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841021 (or 841006 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 42.

The spelling of 19780061280 in words is "nineteen billion, seven hundred eighty million, sixty-one thousand, two hundred eighty".