28121458007 has 4 divisors (see below), whose sum is σ = 28121815080. Its totient is φ = 28121100936.

The previous prime is 28121457997. The next prime is 28121458063. The reversal of 28121458007 is 70085412182.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28121458007 - 2⁸ = 28121457751 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 (28121458067) 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, 2633 + ... + 237170.

It is an arithmetic number, because the mean of its divisors is an integer number (7030453770).

Almost surely, 2^28121458007 is an apocalyptic number.

28121458007 is a deficient number, since it is larger than the sum of its proper divisors (357073).

28121458007 is a wasteful number, since it uses less digits than its factorization.

28121458007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357072.

The product of its (nonzero) digits is 35840, while the sum is 38.

The spelling of 28121458007 in words is "twenty-eight billion, one hundred twenty-one million, four hundred fifty-eight thousand, seven".