28155658834 has 16 divisors (see below), whose sum is σ = 42348780000. Its totient is φ = 14039440704.

The previous prime is 28155658819. The next prime is 28155658841. The reversal of 28155658834 is 43885655182.

It is a super-2 number, since 2×28155658834² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1476549 + ... + 1495495.

It is an arithmetic number, because the mean of its divisors is an integer number (2646798750).

Almost surely, 2^28155658834 is an apocalyptic number.

28155658834 is a deficient number, since it is larger than the sum of its proper divisors (14193121166).

28155658834 is a wasteful number, since it uses less digits than its factorization.

28155658834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20937.

The product of its digits is 9216000, while the sum is 55.

The spelling of 28155658834 in words is "twenty-eight billion, one hundred fifty-five million, six hundred fifty-eight thousand, eight hundred thirty-four".