28450402649 has 4 divisors (see below), whose sum is σ = 30123955764. Its totient is φ = 26776849536.

The previous prime is 28450402627. The next prime is 28450402679. The reversal of 28450402649 is 94620405482.

It is a happy number.

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 16882324624 + 11568078025 = 129932^2 + 107555^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28450402649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28450402679) 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, 836776532 + ... + 836776565.

It is an arithmetic number, because the mean of its divisors is an integer number (7530988941).

Almost surely, 2^28450402649 is an apocalyptic number.

It is an amenable number.

28450402649 is a deficient number, since it is larger than the sum of its proper divisors (1673553115).

28450402649 is a wasteful number, since it uses less digits than its factorization.

28450402649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1673553114.

The product of its (nonzero) digits is 552960, while the sum is 44.

The spelling of 28450402649 in words is "twenty-eight billion, four hundred fifty million, four hundred two thousand, six hundred forty-nine".