28917906 has 16 divisors (see below), whose sum is σ = 58816800. Its totient is φ = 9475808.

The previous prime is 28917893. The next prime is 28917919. The reversal of 28917906 is 60971982.

It is an interprime number because it is at equal distance from previous prime (28917893) and next prime (28917919).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40491 + ... + 41198.

It is an arithmetic number, because the mean of its divisors is an integer number (3676050).

Almost surely, 2^28917906 is an apocalyptic number.

28917906 is an abundant number, since it is smaller than the sum of its proper divisors (29898894).

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

28917906 is a wasteful number, since it uses less digits than its factorization.

28917906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81753.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 28917906 is about 5377.5371686303. The cubic root of 28917906 is about 306.9415019382.

The spelling of 28917906 in words is "twenty-eight million, nine hundred seventeen thousand, nine hundred six".