33528729 has 16 divisors (see below), whose sum is σ = 48645632. Its totient is φ = 20418048.

The previous prime is 33528721. The next prime is 33528731. The reversal of 33528729 is 92782533.

It is not a de Polignac number, because 33528729 - 2³ = 33528721 is a prime.

It is a super-2 number, since 2×33528729² = 2248351336710882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33528721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 649 + ... + 8214.

It is an arithmetic number, because the mean of its divisors is an integer number (3040352).

Almost surely, 2^33528729 is an apocalyptic number.

33528729 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

It is an amenable number.

33528729 is a deficient number, since it is larger than the sum of its proper divisors (15116903).

33528729 is a wasteful number, since it uses less digits than its factorization.

33528729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8976.

The product of its digits is 90720, while the sum is 39.

The square root of 33528729 is about 5790.3997271346. The cubic root of 33528729 is about 322.4574115987.

The spelling of 33528729 in words is "thirty-three million, five hundred twenty-eight thousand, seven hundred twenty-nine".