2646445820 has 48 divisors (see below), whose sum is σ = 5845125888. Its totient is φ = 1005089280.

The previous prime is 2646445783. The next prime is 2646445871. The reversal of 2646445820 is 285446462.

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, 7409 + ... + 73128.

It is an arithmetic number, because the mean of its divisors is an integer number (121773456).

Almost surely, 2^2646445820 is an apocalyptic number.

2646445820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2646445820 is an abundant number, since it is smaller than the sum of its proper divisors (3198680068).

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

2646445820 is a wasteful number, since it uses less digits than its factorization.

2646445820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80630 (or 80628 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 41.

The square root of 2646445820 is about 51443.6178743292. The cubic root of 2646445820 is about 1383.2085637052.

The spelling of 2646445820 in words is "two billion, six hundred forty-six million, four hundred forty-five thousand, eight hundred twenty".