2812749786 has 144 divisors (see below), whose sum is σ = 7940342592. Its totient is φ = 730477440.

The previous prime is 2812749781. The next prime is 2812749799. The reversal of 2812749786 is 6879472182.

It is a happy number.

2812749786 is a `hidden beast` number, since 28 + 127 + 497 + 8 + 6 = 666.

It is a super-2 number, since 2×2812749786² = 15823122717286091592, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (2812749781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 408226 + ... + 415058.

It is an arithmetic number, because the mean of its divisors is an integer number (55141268).

Almost surely, 2^2812749786 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2812749786, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3970171296).

2812749786 is an abundant number, since it is smaller than the sum of its proper divisors (5127592806).

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

2812749786 is a wasteful number, since it uses less digits than its factorization.

2812749786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6879 (or 6856 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 54.

The square root of 2812749786 is about 53035.3635416973. The cubic root of 2812749786 is about 1411.5958301068.

The spelling of 2812749786 in words is "two billion, eight hundred twelve million, seven hundred forty-nine thousand, seven hundred eighty-six".