28364455649 has 4 divisors (see below), whose sum is σ = 28383583536. Its totient is φ = 28345327764.

The previous prime is 28364455621. The next prime is 28364455657. The reversal of 28364455649 is 94655446382.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28364455649 - 2²⁰ = 28363407073 is a prime.

It is a super-2 number, since 2×28364455649² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28364455594 and 28364455603.

It is not an unprimeable number, because it can be changed into a prime (28364455699) 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, 9561719 + ... + 9564684.

It is an arithmetic number, because the mean of its divisors is an integer number (7095895884).

Almost surely, 2^28364455649 is an apocalyptic number.

It is an amenable number.

28364455649 is a deficient number, since it is larger than the sum of its proper divisors (19127887).

28364455649 is a wasteful number, since it uses less digits than its factorization.

28364455649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19127886.

The product of its digits is 24883200, while the sum is 56.

The spelling of 28364455649 in words is "twenty-eight billion, three hundred sixty-four million, four hundred fifty-five thousand, six hundred forty-nine".