28193628 has 24 divisors (see below), whose sum is σ = 65882880. Its totient is φ = 9383920.

The previous prime is 28193623. The next prime is 28193639. The reversal of 28193628 is 82639182.

It is a happy number.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28193623) 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, 9643 + ... + 12221.

It is an arithmetic number, because the mean of its divisors is an integer number (2745120).

Almost surely, 2^28193628 is an apocalyptic number.

It is an amenable number.

28193628 is an abundant number, since it is smaller than the sum of its proper divisors (37689252).

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

28193628 is a wasteful number, since it uses less digits than its factorization.

28193628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3497 (or 3495 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 28193628 is about 5309.7672265364. The cubic root of 28193628 is about 304.3572525551.

The spelling of 28193628 in words is "twenty-eight million, one hundred ninety-three thousand, six hundred twenty-eight".