2805278280 has 64 divisors (see below), whose sum is σ = 9618099840. Its totient is φ = 641206272.

The previous prime is 2805278249. The next prime is 2805278297. The reversal of 2805278280 is 828725082.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1668969 + ... + 1670648.

It is an arithmetic number, because the mean of its divisors is an integer number (150282810).

Almost surely, 2^2805278280 is an apocalyptic number.

2805278280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2805278280 is an abundant number, since it is smaller than the sum of its proper divisors (6812821560).

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

2805278280 is a wasteful number, since it uses less digits than its factorization.

2805278280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3339638 (or 3339634 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 42.

The square root of 2805278280 is about 52964.8777965172. The cubic root of 2805278280 is about 1410.3448480001.

The spelling of 2805278280 in words is "two billion, eight hundred five million, two hundred seventy-eight thousand, two hundred eighty".