33430428 has 24 divisors (see below), whose sum is σ = 86671760. Its totient is φ = 11143440.

The previous prime is 33430427. The next prime is 33430429. The reversal of 33430428 is 82403433.

33430428 is a `hidden beast` number, since 334 + 304 + 28 = 666.

It is an interprime number because it is at equal distance from previous prime (33430427) and next prime (33430429).

It is a super-2 number, since 2×33430428² = 2235187032526368, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33430427) 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, 154663 + ... + 154878.

Almost surely, 2^33430428 is an apocalyptic number.

It is an amenable number.

33430428 is an abundant number, since it is smaller than the sum of its proper divisors (53241332).

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

33430428 is a wasteful number, since it uses less digits than its factorization.

33430428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309554 (or 309546 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 33430428 is about 5781.9052223294. The cubic root of 33430428 is about 322.1419715241.

The spelling of 33430428 in words is "thirty-three million, four hundred thirty thousand, four hundred twenty-eight".