28491750 has 192 divisors, whose sum is σ = 92671488. Its totient is φ = 6415200.

The previous prime is 28491721. The next prime is 28491751. The reversal of 28491750 is 5719482.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28491751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 425217 + ... + 425283.

It is an arithmetic number, because the mean of its divisors is an integer number (482664).

Almost surely, 2^28491750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28491750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46335744).

28491750 is an abundant number, since it is smaller than the sum of its proper divisors (64179738).

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

28491750 is an equidigital number, since it uses as much as digits as its factorization.

28491750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 28491750 is about 5337.7663867951. The cubic root of 28491750 is about 305.4262605709.

It can be divided in two parts, 28491 and 750, that added together give a square (29241 = 171²).

The spelling of 28491750 in words is "twenty-eight million, four hundred ninety-one thousand, seven hundred fifty".