28100134949 has 12 divisors (see below), whose sum is σ = 29664233280. Its totient is φ = 26614624680.

The previous prime is 28100134943. The next prime is 28100134967. The reversal of 28100134949 is 94943100182.

It is not a de Polignac number, because 28100134949 - 2¹² = 28100130853 is a prime.

It is a super-2 number, since 2×28100134949² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28100134943) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2101214 + ... + 2114544.

It is an arithmetic number, because the mean of its divisors is an integer number (2472019440).

Almost surely, 2^28100134949 is an apocalyptic number.

It is an amenable number.

28100134949 is a deficient number, since it is larger than the sum of its proper divisors (1564098331).

28100134949 is a wasteful number, since it uses less digits than its factorization.

28100134949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19208 (or 19189 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 41.

The spelling of 28100134949 in words is "twenty-eight billion, one hundred million, one hundred thirty-four thousand, nine hundred forty-nine".