3221919978 has 32 divisors (see below), whose sum is σ = 6489818496. Its totient is φ = 1066325568.

The previous prime is 3221919977. The next prime is 3221919989. The reversal of 3221919978 is 8799191223.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3221919978.

It is not an unprimeable number, because it can be changed into a prime (3221919977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1454800 + ... + 1457012.

It is an arithmetic number, because the mean of its divisors is an integer number (202806828).

Almost surely, 2^3221919978 is an apocalyptic number.

3221919978 is an abundant number, since it is smaller than the sum of its proper divisors (3267898518).

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

3221919978 is a wasteful number, since it uses less digits than its factorization.

3221919978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3838.

The product of its digits is 489888, while the sum is 51.

The square root of 3221919978 is about 56761.9588985440. The cubic root of 3221919978 is about 1476.9696911248.

The spelling of 3221919978 in words is "three billion, two hundred twenty-one million, nine hundred nineteen thousand, nine hundred seventy-eight".