28708294890 has 32 divisors (see below), whose sum is σ = 75163536576. Its totient is φ = 6959586560.

The previous prime is 28708294883. The next prime is 28708294903. The reversal of 28708294890 is 9849280782.

It is a super-2 number, since 2×28708294890² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28708294890.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 43497087 + ... + 43497746.

It is an arithmetic number, because the mean of its divisors is an integer number (2348860518).

Almost surely, 2^28708294890 is an apocalyptic number.

28708294890 is an abundant number, since it is smaller than the sum of its proper divisors (46455241686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28708294890 is a wasteful number, since it uses less digits than its factorization.

28708294890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86994854.

The product of its (nonzero) digits is 4644864, while the sum is 57.

The spelling of 28708294890 in words is "twenty-eight billion, seven hundred eight million, two hundred ninety-four thousand, eight hundred ninety".