28433388 has 12 divisors (see below), whose sum is σ = 66344600. Its totient is φ = 9477792.

The previous prime is 28433371. The next prime is 28433389. The reversal of 28433388 is 88333482.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (28433389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1184713 + ... + 1184736.

Almost surely, 2^28433388 is an apocalyptic number.

It is an amenable number.

28433388 is an abundant number, since it is smaller than the sum of its proper divisors (37911212).

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

28433388 is a wasteful number, since it uses less digits than its factorization.

28433388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2369456 (or 2369454 counting only the distinct ones).

The product of its digits is 110592, while the sum is 39.

The square root of 28433388 is about 5332.2966909203. The cubic root of 28433388 is about 305.2175747549.

The spelling of 28433388 in words is "twenty-eight million, four hundred thirty-three thousand, three hundred eighty-eight".