28201906 has 8 divisors (see below), whose sum is σ = 42812784. Its totient is φ = 13930980.

The previous prime is 28201903. The next prime is 28201907. The reversal of 28201906 is 60910282.

It is a happy number.

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 (28201903) 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, 84780 + ... + 85111.

It is an arithmetic number, because the mean of its divisors is an integer number (5351598).

Almost surely, 2^28201906 is an apocalyptic number.

28201906 is a deficient number, since it is larger than the sum of its proper divisors (14610878).

28201906 is a wasteful number, since it uses less digits than its factorization.

28201906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169976.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 28201906 is about 5310.5466761907. The cubic root of 28201906 is about 304.3870373324.

The spelling of 28201906 in words is "twenty-eight million, two hundred one thousand, nine hundred six".