28451250 has 100 divisors (see below), whose sum is σ = 79947846. Its totient is φ = 7560000.

The previous prime is 28451243. The next prime is 28451257. The reversal of 28451250 is 5215482.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28451243) and next prime (28451257).

It can be written as a sum of positive squares in 5 ways, for example, as 1108809 + 27342441 = 1053^2 + 5229^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (28451257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 49 ways as a sum of consecutive naturals, for example, 101110 + ... + 101390.

Almost surely, 2^28451250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28451250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39973923).

28451250 is an abundant number, since it is smaller than the sum of its proper divisors (51496596).

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

28451250 is an equidigital number, since it uses as much as digits as its factorization.

28451250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315 (or 291 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 28451250 is about 5333.9713160084. The cubic root of 28451250 is about 305.2814744574.

It can be divided in two parts, 2845 and 1250, that added together give a triangular number (4095 = T₉₀).

The spelling of 28451250 in words is "twenty-eight million, four hundred fifty-one thousand, two hundred fifty".