2643696405 has 96 divisors (see below), whose sum is σ = 5443925760. Its totient is φ = 1161216000.

The previous prime is 2643696403. The next prime is 2643696413. The reversal of 2643696405 is 5046963462.

It is not a de Polignac number, because 2643696405 - 2¹ = 2643696403 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2643696403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2292309 + ... + 2293461.

It is an arithmetic number, because the mean of its divisors is an integer number (56707560).

Almost surely, 2^2643696405 is an apocalyptic number.

It is an amenable number.

2643696405 is an abundant number, since it is smaller than the sum of its proper divisors (2800229355).

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

2643696405 is a wasteful number, since it uses less digits than its factorization.

2643696405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1451 (or 1448 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 45.

The square root of 2643696405 is about 51416.8883247518. Note that the first 3 decimals coincide. The cubic root of 2643696405 is about 1382.7293886925.

The spelling of 2643696405 in words is "two billion, six hundred forty-three million, six hundred ninety-six thousand, four hundred five".