28037394 has 96 divisors (see below), whose sum is σ = 78395520. Its totient is φ = 7270560.

The previous prime is 28037381. The next prime is 28037411. The reversal of 28037394 is 49373082.

28037394 is a `hidden beast` number, since 280 + 373 + 9 + 4 = 666.

It is a super-2 number, since 2×28037394² = 1572190924622472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 45432 + ... + 46044.

It is an arithmetic number, because the mean of its divisors is an integer number (816620).

Almost surely, 2^28037394 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28037394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39197760).

28037394 is an abundant number, since it is smaller than the sum of its proper divisors (50358126).

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

28037394 is a wasteful number, since it uses less digits than its factorization.

28037394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653 (or 636 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 28037394 is about 5295.0348440780. The cubic root of 28037394 is about 303.7940158741.

The spelling of 28037394 in words is "twenty-eight million, thirty-seven thousand, three hundred ninety-four".