28931958 has 64 divisors (see below), whose sum is σ = 71539200. Its totient is φ = 8592480.

The previous prime is 28931957. The next prime is 28931963. The reversal of 28931958 is 85913982.

It is a happy number.

28931958 is a `hidden beast` number, since 289 + 319 + 58 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28931957) 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 31 ways as a sum of consecutive naturals, for example, 31023 + ... + 31941.

It is an arithmetic number, because the mean of its divisors is an integer number (1117800).

Almost surely, 2^28931958 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28931958, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35769600).

28931958 is an abundant number, since it is smaller than the sum of its proper divisors (42607242).

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

28931958 is a wasteful number, since it uses less digits than its factorization.

28931958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994 (or 988 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 28931958 is about 5378.8435560072. The cubic root of 28931958 is about 306.9912109726.

It can be divided in two parts, 2893 and 1958, that added together give a triangular number (4851 = T₉₈).

The spelling of 28931958 in words is "twenty-eight million, nine hundred thirty-one thousand, nine hundred fifty-eight".