28351700 has 72 divisors (see below), whose sum is σ = 67188408. Its totient is φ = 10321920.

The previous prime is 28351643. The next prime is 28351703. The reversal of 28351700 is 715382.

It can be written as a sum of positive squares in 12 ways, for example, as 24462916 + 3888784 = 4946^2 + 1972^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 28351700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28351703) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 146804 + ... + 146996.

Almost surely, 2^28351700 is an apocalyptic number.

28351700 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 28351700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33594204).

28351700 is an abundant number, since it is smaller than the sum of its proper divisors (38836708).

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

28351700 is a wasteful number, since it uses less digits than its factorization.

28351700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333 (or 326 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 28351700 is about 5324.6314426446. The cubic root of 28351700 is about 304.9250017156.

The spelling of 28351700 in words is "twenty-eight million, three hundred fifty-one thousand, seven hundred".