23206828491 has 72 divisors (see below), whose sum is σ = 42442330112. Its totient is φ = 11960071200.

The previous prime is 23206828481. The next prime is 23206828507. The reversal of 23206828491 is 19482860232.

It is not a de Polignac number, because 23206828491 - 2¹⁰ = 23206827467 is a prime.

It is a super-2 number, since 2×23206828491² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23206828451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 956136 + ... + 980106.

Almost surely, 2^23206828491 is an apocalyptic number.

23206828491 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

23206828491 is a deficient number, since it is larger than the sum of its proper divisors (19235501621).

23206828491 is a wasteful number, since it uses less digits than its factorization.

23206828491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24133 (or 24119 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 23206828491 in words is "twenty-three billion, two hundred six million, eight hundred twenty-eight thousand, four hundred ninety-one".