19772009280 has 140 divisors (see below), whose sum is σ = 70332607620. Its totient is φ = 5272528896.

The previous prime is 19772009263. The next prime is 19772009333. The reversal of 19772009280 is 8290027791.

It can be written as a sum of positive squares in 2 ways, for example, as 2732361984 + 17039647296 = 52272^2 + 130536^2 .

It is a super-2 number, since 2×19772009280² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 355485 + ... + 407324.

Almost surely, 2^19772009280 is an apocalyptic number.

19772009280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19772009280 is an abundant number, since it is smaller than the sum of its proper divisors (50560598340).

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

19772009280 is an equidigital number, since it uses as much as digits as its factorization.

19772009280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762838 (or 762819 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The spelling of 19772009280 in words is "nineteen billion, seven hundred seventy-two million, nine thousand, two hundred eighty".