28040634 has 64 divisors (see below), whose sum is σ = 65940480. Its totient is φ = 8814960.

The previous prime is 28040627. The next prime is 28040653. The reversal of 28040634 is 43604082.

28040634 is a `hidden beast` number, since 28 + 0 + 4 + 0 + 634 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 28040598 and 28040607.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 132789 + ... + 132999.

It is an arithmetic number, because the mean of its divisors is an integer number (1030320).

Almost surely, 2^28040634 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28040634, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32970240).

28040634 is an abundant number, since it is smaller than the sum of its proper divisors (37899846).

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

28040634 is a wasteful number, since it uses less digits than its factorization.

28040634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352 (or 346 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 28040634 is about 5295.3407822349. The cubic root of 28040634 is about 303.8057175644.

The spelling of 28040634 in words is "twenty-eight million, forty thousand, six hundred thirty-four".