28570000 has 50 divisors (see below), whose sum is σ = 69195038. Its totient is φ = 11424000.

The previous prime is 28569973. The next prime is 28570001. The reversal of 28570000 is 7582.

It can be written as a sum of positive squares in 5 ways, for example, as 8785296 + 19784704 = 2964^2 + 4448^2 .

It is a tau number, because it is divible by the number of its divisors (50).

It is not an unprimeable number, because it can be changed into a prime (28570001) 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 9 ways as a sum of consecutive naturals, for example, 8572 + ... + 11428.

Almost surely, 2^28570000 is an apocalyptic number.

28570000 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 28570000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34597519).

28570000 is an abundant number, since it is smaller than the sum of its proper divisors (40625038).

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

28570000 is an equidigital number, since it uses as much as digits as its factorization.

28570000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2885 (or 2864 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 28570000 is about 5345.0912059571. The cubic root of 28570000 is about 305.7056134695.

Adding to 28570000 its reverse (7582), we get a palindrome (28577582).

The spelling of 28570000 in words is "twenty-eight million, five hundred seventy thousand".