28112780149 has 4 divisors (see below), whose sum is σ = 28128203136. Its totient is φ = 28097357164.

The previous prime is 28112780123. The next prime is 28112780203. The reversal of 28112780149 is 94108721182.

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 28112780149 - 2⁵ = 28112780117 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 (28112787149) 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, 7708759 + ... + 7712404.

It is an arithmetic number, because the mean of its divisors is an integer number (7032050784).

Almost surely, 2^28112780149 is an apocalyptic number.

It is an amenable number.

28112780149 is a deficient number, since it is larger than the sum of its proper divisors (15422987).

28112780149 is a wasteful number, since it uses less digits than its factorization.

28112780149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15422986.

The product of its (nonzero) digits is 64512, while the sum is 43.

The spelling of 28112780149 in words is "twenty-eight billion, one hundred twelve million, seven hundred eighty thousand, one hundred forty-nine".