19772793280 has 28 divisors (see below), whose sum is σ = 47083964760. Its totient is φ = 7909117184.

The previous prime is 19772793259. The next prime is 19772793283. The reversal of 19772793280 is 8239727791.

It is a happy number.

It is a super-2 number, since 2×19772793280² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19772793283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30894670 + ... + 30895309.

It is an arithmetic number, because the mean of its divisors is an integer number (1681570170).

Almost surely, 2^19772793280 is an apocalyptic number.

19772793280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19772793280 is an abundant number, since it is smaller than the sum of its proper divisors (27311171480).

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

19772793280 is an equidigital number, since it uses as much as digits as its factorization.

19772793280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61789996 (or 61789986 counting only the distinct ones).

The product of its (nonzero) digits is 2667168, while the sum is 55.

The spelling of 19772793280 in words is "nineteen billion, seven hundred seventy-two million, seven hundred ninety-three thousand, two hundred eighty".