2785581872220 has 96 divisors (see below), whose sum is σ = 8914431633408. Its totient is φ = 636663739392.

The previous prime is 2785581872207. The next prime is 2785581872221. The reversal of 2785581872220 is 222781855872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2785581872221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6630877 + ... + 7038443.

It is an arithmetic number, because the mean of its divisors is an integer number (92858662848).

Almost surely, 2^{2785581872220} is an apocalyptic number.

2785581872220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2785581872220 is an abundant number, since it is smaller than the sum of its proper divisors (6128849761188).

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

2785581872220 is a wasteful number, since it uses less digits than its factorization.

2785581872220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423859 (or 423857 counting only the distinct ones).

The product of its (nonzero) digits is 10035200, while the sum is 57.

The spelling of 2785581872220 in words is "two trillion, seven hundred eighty-five billion, five hundred eighty-one million, eight hundred seventy-two thousand, two hundred twenty".