28947786 has 16 divisors (see below), whose sum is σ = 66166464. Its totient is φ = 8270784.

The previous prime is 28947739. The next prime is 28947791. The reversal of 28947786 is 68774982.

It is a Curzon number.

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, 344575 + ... + 344658.

It is an arithmetic number, because the mean of its divisors is an integer number (4135404).

Almost surely, 2^28947786 is an apocalyptic number.

28947786 is an abundant number, since it is smaller than the sum of its proper divisors (37218678).

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

28947786 is a wasteful number, since it uses less digits than its factorization.

28947786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689245.

The product of its digits is 1354752, while the sum is 51.

The square root of 28947786 is about 5380.3146748122. The cubic root of 28947786 is about 307.0471833459.

The spelling of 28947786 in words is "twenty-eight million, nine hundred forty-seven thousand, seven hundred eighty-six".