28913000 has 64 divisors (see below), whose sum is σ = 70059600. Its totient is φ = 11155200.

The previous prime is 28912999. The next prime is 28913023. The reversal of 28913000 is 31982.

It can be written as a sum of positive squares in 8 ways, for example, as 4251844 + 24661156 = 2062^2 + 4966^2 .

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 28502 + ... + 29498.

Almost surely, 2^28913000 is an apocalyptic number.

28913000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28913000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35029800).

28913000 is an abundant number, since it is smaller than the sum of its proper divisors (41146600).

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

28913000 is a wasteful number, since it uses less digits than its factorization.

28913000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047 (or 1033 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 28913000 is about 5377.0809925089. The cubic root of 28913000 is about 306.9241431413.

Adding to 28913000 its reverse (31982), we get a palindrome (28944982).

The spelling of 28913000 in words is "twenty-eight million, nine hundred thirteen thousand".