28006340 has 24 divisors (see below), whose sum is σ = 59149440. Its totient is φ = 11138528.

The previous prime is 28006339. The next prime is 28006343. The reversal of 28006340 is 4360082.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28006343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 332 + ... + 7491.

It is an arithmetic number, because the mean of its divisors is an integer number (2464560).

Almost surely, 2^28006340 is an apocalyptic number.

28006340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28006340 is an abundant number, since it is smaller than the sum of its proper divisors (31143100).

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

28006340 is a wasteful number, since it uses less digits than its factorization.

28006340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8011 (or 8009 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 28006340 is about 5292.1016619109. The cubic root of 28006340 is about 303.6818144747.

The spelling of 28006340 in words is "twenty-eight million, six thousand, three hundred forty".