33642428 has 6 divisors (see below), whose sum is σ = 58874256. Its totient is φ = 16821212.

The previous prime is 33642421. The next prime is 33642437. The reversal of 33642428 is 82424633.

It is a super-2 number, since 2×33642428² = 2263625923470368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 33642394 and 33642403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33642421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4205300 + ... + 4205307.

It is an arithmetic number, because the mean of its divisors is an integer number (9812376).

Almost surely, 2^33642428 is an apocalyptic number.

It is an amenable number.

33642428 is a deficient number, since it is larger than the sum of its proper divisors (25231828).

33642428 is a wasteful number, since it uses less digits than its factorization.

33642428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8410611 (or 8410609 counting only the distinct ones).

The product of its digits is 27648, while the sum is 32.

The square root of 33642428 is about 5800.2093065682. The cubic root of 33642428 is about 322.8214945966.

The spelling of 33642428 in words is "thirty-three million, six hundred forty-two thousand, four hundred twenty-eight".