28029240 has 160 divisors (see below), whose sum is σ = 96964560. Its totient is φ = 7257600.

The previous prime is 28029233. The next prime is 28029251. The reversal of 28029240 is 4292082.

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

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 132735 + ... + 132945.

Almost surely, 2^28029240 is an apocalyptic number.

28029240 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 28029240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48482280).

28029240 is an abundant number, since it is smaller than the sum of its proper divisors (68935320).

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

28029240 is a wasteful number, since it uses less digits than its factorization.

28029240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275 (or 262 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 28029240 is about 5294.2648214837. The cubic root of 28029240 is about 303.7645626306.

The spelling of 28029240 in words is "twenty-eight million, twenty-nine thousand, two hundred forty".