28122251958 has 24 divisors (see below), whose sum is σ = 62897080896. Its totient is φ = 9071694000.

The previous prime is 28122251923. The next prime is 28122251959. The reversal of 28122251958 is 85915222182.

28122251958 is a `hidden beast` number, since 2 + 8 + 122 + 2 + 519 + 5 + 8 = 666.

It is a super-2 number, since 2×28122251958² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28122251959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25198593 + ... + 25199708.

It is an arithmetic number, because the mean of its divisors is an integer number (2620711704).

Almost surely, 2^28122251958 is an apocalyptic number.

28122251958 is an abundant number, since it is smaller than the sum of its proper divisors (34774828938).

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

28122251958 is a wasteful number, since it uses less digits than its factorization.

28122251958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50398340 (or 50398337 counting only the distinct ones).

The product of its digits is 230400, while the sum is 45.

The spelling of 28122251958 in words is "twenty-eight billion, one hundred twenty-two million, two hundred fifty-one thousand, nine hundred fifty-eight".