28491983263 has 4 divisors (see below), whose sum is σ = 29730765168. Its totient is φ = 27253201360.

The previous prime is 28491983207. The next prime is 28491983321. The reversal of 28491983263 is 36238919482.

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

It is a cyclic number.

It is not a de Polignac number, because 28491983263 - 2³³ = 19902048671 is a prime.

It is a super-2 number, since 2×28491983263² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28491923263) 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, 619390918 + ... + 619390963.

It is an arithmetic number, because the mean of its divisors is an integer number (7432691292).

Almost surely, 2^28491983263 is an apocalyptic number.

28491983263 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

28491983263 is a deficient number, since it is larger than the sum of its proper divisors (1238781905).

28491983263 is a wasteful number, since it uses less digits than its factorization.

28491983263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1238781904.

The product of its digits is 4478976, while the sum is 55.

The spelling of 28491983263 in words is "twenty-eight billion, four hundred ninety-one million, nine hundred eighty-three thousand, two hundred sixty-three".