33398890 has 24 divisors (see below), whose sum is σ = 69934212. Its totient is φ = 11450880.

The previous prime is 33398881. The next prime is 33398891. The reversal of 33398890 is 9889333.

It can be written as a sum of positive squares in 2 ways, for example, as 33028009 + 370881 = 5747^2 + 609^2 .

It is a super-2 number, since 2×33398890² = 2230971706464200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (33398891) 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, 33591 + ... + 34570.

Almost surely, 2^33398890 is an apocalyptic number.

33398890 is an abundant number, since it is smaller than the sum of its proper divisors (36535322).

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

33398890 is a wasteful number, since it uses less digits than its factorization.

33398890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68182 (or 68175 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 33398890 is about 5779.1772770871. The cubic root of 33398890 is about 322.0406375933.

The spelling of 33398890 in words is "thirty-three million, three hundred ninety-eight thousand, eight hundred ninety".