28381958 has 16 divisors (see below), whose sum is σ = 47206800. Its totient is φ = 12688800.

The previous prime is 28381939. The next prime is 28381973. The reversal of 28381958 is 85918382.

It is a congruent number.

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, 9233 + ... + 11916.

It is an arithmetic number, because the mean of its divisors is an integer number (2950425).

Almost surely, 2^28381958 is an apocalyptic number.

28381958 is a deficient number, since it is larger than the sum of its proper divisors (18824842).

28381958 is a wasteful number, since it uses less digits than its factorization.

28381958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21223.

The product of its digits is 138240, while the sum is 44.

The square root of 28381958 is about 5327.4720083732. The cubic root of 28381958 is about 305.0334389567.

The spelling of 28381958 in words is "twenty-eight million, three hundred eighty-one thousand, nine hundred fifty-eight".