33172840 has 32 divisors (see below), whose sum is σ = 75043080. Its totient is φ = 13197312.

The previous prime is 33172819. The next prime is 33172847. The reversal of 33172840 is 4827133.

It can be written as a sum of positive squares in 4 ways, for example, as 23174596 + 9998244 = 4814^2 + 3162^2 .

It is a super-2 number, since 2×33172840² = 2200874627331200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 33172799 and 33172808.

It is not an unprimeable number, because it can be changed into a prime (33172847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5572 + ... + 9868.

Almost surely, 2^33172840 is an apocalyptic number.

It is an amenable number.

33172840 is an abundant number, since it is smaller than the sum of its proper divisors (41870240).

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

33172840 is a wasteful number, since it uses less digits than its factorization.

33172840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4501 (or 4497 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 33172840 is about 5759.5867907342. The cubic root of 33172840 is about 321.3124483058.

Adding to 33172840 its reverse (4827133), we get a palindrome (37999973).

The spelling of 33172840 in words is "thirty-three million, one hundred seventy-two thousand, eight hundred forty".