28945784 has 32 divisors (see below), whose sum is σ = 62229600. Its totient is φ = 12364800.

The previous prime is 28945757. The next prime is 28945789. The reversal of 28945784 is 48754982.

It is a happy number.

It is a super-2 number, since 2×28945784² = 1675716822749312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28945789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21812 + ... + 23100.

It is an arithmetic number, because the mean of its divisors is an integer number (1944675).

Almost surely, 2^28945784 is an apocalyptic number.

It is an amenable number.

28945784 is an abundant number, since it is smaller than the sum of its proper divisors (33283816).

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

28945784 is a wasteful number, since it uses less digits than its factorization.

28945784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1703 (or 1699 counting only the distinct ones).

The product of its digits is 645120, while the sum is 47.

The square root of 28945784 is about 5380.1286229978. The cubic root of 28945784 is about 307.0401048238.

The spelling of 28945784 in words is "twenty-eight million, nine hundred forty-five thousand, seven hundred eighty-four".