19978280442 has 48 divisors (see below), whose sum is σ = 44001528480. Its totient is φ = 6550098336.

The previous prime is 19978280437. The next prime is 19978280449. The reversal of 19978280442 is 24408287991.

19978280442 is a `hidden beast` number, since 199 + 7 + 8 + 2 + 8 + 0 + 442 = 666.

It is not an unprimeable number, because it can be changed into a prime (19978280449) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 309684 + ... + 368592.

It is an arithmetic number, because the mean of its divisors is an integer number (916698510).

Almost surely, 2^19978280442 is an apocalyptic number.

19978280442 is an abundant number, since it is smaller than the sum of its proper divisors (24023248038).

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

19978280442 is a wasteful number, since it uses less digits than its factorization.

19978280442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59227 (or 59224 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The spelling of 19978280442 in words is "nineteen billion, nine hundred seventy-eight million, two hundred eighty thousand, four hundred forty-two".