28423599649 has 9 divisors (see below), whose sum is σ = 28979122809. Its totient is φ = 27878538480.

The previous prime is 28423599593. The next prime is 28423599653. The reversal of 28423599649 is 94699532482.

The square root of 28423599649 is 168593.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 2169230625 + 26254369024 = 46575^2 + 162032^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28423599649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28423599349) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 8933839 + ... + 8937019.

Almost surely, 2^28423599649 is an apocalyptic number.

28423599649 is the 168593-rd square number.

28423599649 is the 84297-th centered octagonal number.

It is an amenable number.

28423599649 is a deficient number, since it is larger than the sum of its proper divisors (555523160).

28423599649 is an frugal number, since it uses more digits than its factorization.

28423599649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6468 (or 3234 counting only the distinct ones).

The product of its digits is 33592320, while the sum is 61.

The spelling of 28423599649 in words is "twenty-eight billion, four hundred twenty-three million, five hundred ninety-nine thousand, six hundred forty-nine".