28215958 has 16 divisors (see below), whose sum is σ = 42950160. Its totient is φ = 13900896.

The previous prime is 28215953. The next prime is 28215961. The reversal of 28215958 is 85951282.

It is a super-2 number, since 2×28215958² = 1592280571715528, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28215958.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28215953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75460 + ... + 75832.

It is an arithmetic number, because the mean of its divisors is an integer number (2684385).

Almost surely, 2^28215958 is an apocalyptic number.

28215958 is a deficient number, since it is larger than the sum of its proper divisors (14734202).

28215958 is a wasteful number, since it uses less digits than its factorization.

28215958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831.

The product of its digits is 57600, while the sum is 40.

The square root of 28215958 is about 5311.8695390606. The cubic root of 28215958 is about 304.4375839922.

The spelling of 28215958 in words is "twenty-eight million, two hundred fifteen thousand, nine hundred fifty-eight".