33897720 has 32 divisors (see below), whose sum is σ = 101693520. Its totient is φ = 9039360.

The previous prime is 33897701. The next prime is 33897727. The reversal of 33897720 is 2779833.

It is a super-2 number, since 2×33897720² = 2298110842396800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33897727) 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, 141121 + ... + 141360.

Almost surely, 2^33897720 is an apocalyptic number.

33897720 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

33897720 is an abundant number, since it is smaller than the sum of its proper divisors (67795800).

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

33897720 is a wasteful number, since it uses less digits than its factorization.

33897720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282495 (or 282491 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 39.

The square root of 33897720 is about 5822.1748513764. The cubic root of 33897720 is about 323.6360033547.

The spelling of 33897720 in words is "thirty-three million, eight hundred ninety-seven thousand, seven hundred twenty".