2784620856 has 64 divisors (see below), whose sum is σ = 7292229120. Its totient is φ = 884428160.

The previous prime is 2784620837. The next prime is 2784620863. The reversal of 2784620856 is 6580264872.

It is a super-2 number, since 2×2784620856² = 15508226623340345472, which contains 22 as substring.

It is a congruent number.

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, 135586 + ... + 154766.

It is an arithmetic number, because the mean of its divisors is an integer number (113941080).

Almost surely, 2^2784620856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2784620856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3646114560).

2784620856 is an abundant number, since it is smaller than the sum of its proper divisors (4507608264).

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

2784620856 is a wasteful number, since it uses less digits than its factorization.

2784620856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19476 (or 19472 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 48.

The square root of 2784620856 is about 52769.5068766044. The cubic root of 2784620856 is about 1406.8744973675.

The spelling of 2784620856 in words is "two billion, seven hundred eighty-four million, six hundred twenty thousand, eight hundred fifty-six".