2780221864 has 16 divisors (see below), whose sum is σ = 5957618400. Its totient is φ = 1191523632.

The previous prime is 2780221841. The next prime is 2780221891. The reversal of 2780221864 is 4681220872.

2780221864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×2780221864² = 15459267226127268992, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24823354 + ... + 24823465.

It is an arithmetic number, because the mean of its divisors is an integer number (372351150).

Almost surely, 2^2780221864 is an apocalyptic number.

It is an amenable number.

2780221864 is an abundant number, since it is smaller than the sum of its proper divisors (3177396536).

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

2780221864 is a wasteful number, since it uses less digits than its factorization.

2780221864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49646832 (or 49646828 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 40.

The square root of 2780221864 is about 52727.8092091830. The cubic root of 2780221864 is about 1406.1332724076.

The spelling of 2780221864 in words is "two billion, seven hundred eighty million, two hundred twenty-one thousand, eight hundred sixty-four".