2809798644 has 12 divisors (see below), whose sum is σ = 6556196864. Its totient is φ = 936599544.

The previous prime is 2809798643. The next prime is 2809798723. The reversal of 2809798644 is 4468979082.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2809798643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117074932 + ... + 117074955.

Almost surely, 2^2809798644 is an apocalyptic number.

It is an amenable number.

2809798644 is an abundant number, since it is smaller than the sum of its proper divisors (3746398220).

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

2809798644 is a wasteful number, since it uses less digits than its factorization.

2809798644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234149894 (or 234149892 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 57.

The square root of 2809798644 is about 53007.5338418984. The cubic root of 2809798644 is about 1411.1019744096.

The spelling of 2809798644 in words is "two billion, eight hundred nine million, seven hundred ninety-eight thousand, six hundred forty-four".