28250064 has 30 divisors (see below), whose sum is σ = 79061346. Its totient is φ = 9416640.

The previous prime is 28250059. The next prime is 28250071. The reversal of 28250064 is 46005282.

It can be written as a sum of positive squares in only one way, i.e., 24088464 + 4161600 = 4908^2 + 2040^2 .

It is a super-2 number, since 2×28250064² = 1596132232008192, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 97947 + ... + 98234.

Almost surely, 2^28250064 is an apocalyptic number.

28250064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28250064 is an abundant number, since it is smaller than the sum of its proper divisors (50811282).

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

28250064 is a wasteful number, since it uses less digits than its factorization.

28250064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196195 (or 196186 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 28250064 is about 5315.0789269775. The cubic root of 28250064 is about 304.5601974380.

The spelling of 28250064 in words is "twenty-eight million, two hundred fifty thousand, sixty-four".