33928561 has 4 divisors (see below), whose sum is σ = 33966400. Its totient is φ = 33890724.

The previous prime is 33928553. The next prime is 33928567. The reversal of 33928561 is 16582933.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 33928561 - 2³ = 33928553 is a prime.

It is a super-2 number, since 2×33928561² = 2302294503061442, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 33928561.

It is not an unprimeable number, because it can be changed into a prime (33928567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17541 + ... + 19378.

It is an arithmetic number, because the mean of its divisors is an integer number (8491600).

Almost surely, 2^33928561 is an apocalyptic number.

It is an amenable number.

33928561 is a deficient number, since it is larger than the sum of its proper divisors (37839).

33928561 is an equidigital number, since it uses as much as digits as its factorization.

33928561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37838.

The product of its digits is 38880, while the sum is 37.

The square root of 33928561 is about 5824.8228299237. The cubic root of 33928561 is about 323.7341243339.

It can be divided in two parts, 339 and 28561, that added together give a square (28900 = 170²).

The spelling of 33928561 in words is "thirty-three million, nine hundred twenty-eight thousand, five hundred sixty-one".