2778228920898 has 54 divisors (see below), whose sum is σ = 6067820393427. Its totient is φ = 918700584360.

The previous prime is 2778228920851. The next prime is 2778228920933. The reversal of 2778228920898 is 8980298228772.

It can be written as a sum of positive squares in only one way, i.e., 1389114460449 + 1389114460449 = 1178607^2 + 1178607^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=1178607.

It is a super-2 number, since 2×2778228920898² (a number of 26 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 926383603 + ... + 926386601.

Almost surely, 2^{2778228920898} is an apocalyptic number.

2778228920898 is an abundant number, since it is smaller than the sum of its proper divisors (3289591472529).

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

2778228920898 is an frugal number, since it uses more digits than its factorization.

2778228920898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6268 (or 3135 counting only the distinct ones).

The product of its (nonzero) digits is 260112384, while the sum is 72.

Multiplying 2778228920898 by its sum of digits (72), we get a square (200032482304656 = 14143284²).

The spelling of 2778228920898 in words is "two trillion, seven hundred seventy-eight billion, two hundred twenty-eight million, nine hundred twenty thousand, eight hundred ninety-eight".