28775906 has 8 divisors (see below), whose sum is σ = 43198464. Its totient is φ = 14376420.

The previous prime is 28775867. The next prime is 28775909. The reversal of 28775906 is 60957782.

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

It is a super-2 number, since 2×28775906² = 1656105532241672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28775909) 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, 2210 + ... + 7901.

It is an arithmetic number, because the mean of its divisors is an integer number (5399808).

Almost surely, 2^28775906 is an apocalyptic number.

28775906 is a deficient number, since it is larger than the sum of its proper divisors (14422558).

28775906 is a wasteful number, since it uses less digits than its factorization.

28775906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11536.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 28775906 is about 5364.3178503888. The cubic root of 28775906 is about 306.4382701302.

The spelling of 28775906 in words is "twenty-eight million, seven hundred seventy-five thousand, nine hundred six".