2829386781 has 56 divisors (see below), whose sum is σ = 4692511320. Its totient is φ = 1693892736.

The previous prime is 2829386761. The next prime is 2829386797. The reversal of 2829386781 is 1876839282.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8820900 + 2820565881 = 2970^2 + 53109^2 .

It is not a de Polignac number, because 2829386781 - 2⁶ = 2829386717 is a prime.

It is a super-2 number, since 2×2829386781² = 16010859112995083922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2829386741) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 346615 + ... + 354683.

It is an arithmetic number, because the mean of its divisors is an integer number (83794845).

Almost surely, 2^2829386781 is an apocalyptic number.

It is an amenable number.

2829386781 is a deficient number, since it is larger than the sum of its proper divisors (1863124539).

2829386781 is an equidigital number, since it uses as much as digits as its factorization.

2829386781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8137 (or 8122 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The square root of 2829386781 is about 53191.9804199844. The cubic root of 2829386781 is about 1414.3734869965.

The spelling of 2829386781 in words is "two billion, eight hundred twenty-nine million, three hundred eighty-six thousand, seven hundred eighty-one".