28406066 has 8 divisors (see below), whose sum is σ = 45886764. Its totient is φ = 13110480.

The previous prime is 28406029. The next prime is 28406069. The reversal of 28406066 is 66060482.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 28313041 + 93025 = 5321^2 + 305^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (28406069) 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, 546245 + ... + 546296.

Almost surely, 2^28406066 is an apocalyptic number.

28406066 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28406066 is a deficient number, since it is larger than the sum of its proper divisors (17480698).

28406066 is a wasteful number, since it uses less digits than its factorization.

28406066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092556.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 28406066 is about 5329.7341397109. The cubic root of 28406066 is about 305.1197809562.

The spelling of 28406066 in words is "twenty-eight million, four hundred six thousand, sixty-six".