33720830 has 32 divisors (see below), whose sum is σ = 71311968. Its totient is φ = 11318400.

The previous prime is 33720821. The next prime is 33720851. The reversal of 33720830 is 3802733.

It is a super-2 number, since 2×33720830² = 2274188751777800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 33720830.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10361 + ... + 13220.

It is an arithmetic number, because the mean of its divisors is an integer number (2228499).

Almost surely, 2^33720830 is an apocalyptic number.

33720830 is an abundant number, since it is smaller than the sum of its proper divisors (37591138).

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

33720830 is a wasteful number, since it uses less digits than its factorization.

33720830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23612.

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 33720830 is about 5806.9639227397. The cubic root of 33720830 is about 323.0720731727.

The spelling of 33720830 in words is "thirty-three million, seven hundred twenty thousand, eight hundred thirty".