2780028025278 has 48 divisors (see below), whose sum is σ = 6479432571024. Its totient is φ = 792867653760.

The previous prime is 2780028025273. The next prime is 2780028025337. The reversal of 2780028025278 is 8725208200872.

It is a happy number.

It is a super-3 number, since 3×2780028025278³ (a number of 38 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2780028025278.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2780028025273) 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, 8324463 + ... + 8651978.

It is an arithmetic number, because the mean of its divisors is an integer number (134988178563).

Almost surely, 2^{2780028025278} is an apocalyptic number.

2780028025278 is an abundant number, since it is smaller than the sum of its proper divisors (3699404545746).

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

2780028025278 is a wasteful number, since it uses less digits than its factorization.

2780028025278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16977017 (or 16977010 counting only the distinct ones).

The product of its (nonzero) digits is 2007040, while the sum is 51.

The spelling of 2780028025278 in words is "two trillion, seven hundred eighty billion, twenty-eight million, twenty-five thousand, two hundred seventy-eight".