2785116978 has 54 divisors (see below), whose sum is σ = 7023584061. Its totient is φ = 795299904.

The previous prime is 2785116937. The next prime is 2785117019. The reversal of 2785116978 is 8796115872.

It is an interprime number because it is at equal distance from previous prime (2785116937) and next prime (2785117019).

It can be written as a sum of positive squares in 2 ways, for example, as 2784989529 + 127449 = 52773^2 + 357^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=37317.

It is a super-2 number, since 2×2785116978² = 15513753162287704968, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1566426 + ... + 1568202.

Almost surely, 2^2785116978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2785116978

2785116978 is an abundant number, since it is smaller than the sum of its proper divisors (4238467083).

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

2785116978 is an equidigital number, since it uses as much as digits as its factorization.

2785116978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3576 (or 1789 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 54.

The square root of 2785116978 is about 52774.2075070768. The cubic root of 2785116978 is about 1406.9580443419.

The spelling of 2785116978 in words is "two billion, seven hundred eighty-five million, one hundred sixteen thousand, nine hundred seventy-eight".