28934240 has 48 divisors (see below), whose sum is σ = 68901840. Its totient is φ = 11481600.

The previous prime is 28934231. The next prime is 28934251. The reversal of 28934240 is 4243982.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 28934197 and 28934206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21590 + ... + 22890.

It is an arithmetic number, because the mean of its divisors is an integer number (1435455).

Almost surely, 2^28934240 is an apocalyptic number.

28934240 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 28934240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34450920).

28934240 is an abundant number, since it is smaller than the sum of its proper divisors (39967600).

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

28934240 is a wasteful number, since it uses less digits than its factorization.

28934240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1455 (or 1447 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 28934240 is about 5379.0556792062. The cubic root of 28934240 is about 306.9992820420. Note that the first 3 decimals are identical.

The spelling of 28934240 in words is "twenty-eight million, nine hundred thirty-four thousand, two hundred forty".