33040728 has 48 divisors (see below), whose sum is σ = 102270480. Its totient is φ = 9440064.

The previous prime is 33040697. The next prime is 33040729. The reversal of 33040728 is 82704033.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33040729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32275 + ... + 33282.

It is an arithmetic number, because the mean of its divisors is an integer number (2130635).

Almost surely, 2^33040728 is an apocalyptic number.

It is an amenable number.

33040728 is an abundant number, since it is smaller than the sum of its proper divisors (69229752).

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

33040728 is a wasteful number, since it uses less digits than its factorization.

33040728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65576 (or 65569 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 33040728 is about 5748.1064708302. The cubic root of 33040728 is about 320.8853347692.

The spelling of 33040728 in words is "thirty-three million, forty thousand, seven hundred twenty-eight".