28867622549 has 4 divisors (see below), whose sum is σ = 28876189440. Its totient is φ = 28859055660.

The previous prime is 28867622527. The next prime is 28867622551. The reversal of 28867622549 is 94522676882.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 94522676882 = 2 ⋅47261338441.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28867622549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28867022549) 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 3 ways as a sum of consecutive naturals, for example, 4278389 + ... + 4285130.

It is an arithmetic number, because the mean of its divisors is an integer number (7219047360).

Almost surely, 2^28867622549 is an apocalyptic number.

It is an amenable number.

28867622549 is a deficient number, since it is larger than the sum of its proper divisors (8566891).

28867622549 is an equidigital number, since it uses as much as digits as its factorization.

28867622549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8566890.

The product of its digits is 23224320, while the sum is 59.

The spelling of 28867622549 in words is "twenty-eight billion, eight hundred sixty-seven million, six hundred twenty-two thousand, five hundred forty-nine".