28433618 has 4 divisors (see below), whose sum is σ = 42650430. Its totient is φ = 14216808.

The previous prime is 28433617. The next prime is 28433663. The reversal of 28433618 is 81633482.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 27699169 + 734449 = 5263^2 + 857^2 .

It is not an unprimeable number, because it can be changed into a prime (28433617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7108403 + ... + 7108406.

Almost surely, 2^28433618 is an apocalyptic number.

28433618 is a deficient number, since it is larger than the sum of its proper divisors (14216812).

28433618 is a wasteful number, since it uses less digits than its factorization.

28433618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14216811.

The product of its digits is 27648, while the sum is 35.

The square root of 28433618 is about 5332.3182575687. The cubic root of 28433618 is about 305.2183977293.

The spelling of 28433618 in words is "twenty-eight million, four hundred thirty-three thousand, six hundred eighteen".