33206728057 has 4 divisors (see below), whose sum is σ = 33210606436. Its totient is φ = 33202849680.

The previous prime is 33206728043. The next prime is 33206728073. The reversal of 33206728057 is 75082760233.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2922375481 + 30284352576 = 54059^2 + 174024^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33206728057 is a prime.

It is a super-2 number, since 2×33206728057² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33206728657) 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, 1926318 + ... + 1943479.

It is an arithmetic number, because the mean of its divisors is an integer number (8302651609).

Almost surely, 2^33206728057 is an apocalyptic number.

It is an amenable number.

33206728057 is a deficient number, since it is larger than the sum of its proper divisors (3878379).

33206728057 is an equidigital number, since it uses as much as digits as its factorization.

33206728057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3878378.

The product of its (nonzero) digits is 423360, while the sum is 43.

The spelling of 33206728057 in words is "thirty-three billion, two hundred six million, seven hundred twenty-eight thousand, fifty-seven".