23642628949 has 4 divisors (see below), whose sum is σ = 23643196236. Its totient is φ = 23642061664.

The previous prime is 23642628923. The next prime is 23642629007. The reversal of 23642628949 is 94982624632.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6220476900 + 17422152049 = 78870^2 + 131993^2 .

It is a cyclic number.

It is not a de Polignac number, because 23642628949 - 2²¹ = 23640531797 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23642628949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23642625949) 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 3 ways as a sum of consecutive naturals, for example, 215704 + ... + 306289.

It is an arithmetic number, because the mean of its divisors is an integer number (5910799059).

Almost surely, 2^23642628949 is an apocalyptic number.

It is an amenable number.

23642628949 is a deficient number, since it is larger than the sum of its proper divisors (567287).

23642628949 is an equidigital number, since it uses as much as digits as its factorization.

23642628949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567286.

The product of its digits is 8957952, while the sum is 55.

The spelling of 23642628949 in words is "twenty-three billion, six hundred forty-two million, six hundred twenty-eight thousand, nine hundred forty-nine".