28746644 has 12 divisors (see below), whose sum is σ = 50872500. Its totient is φ = 14211648.

The previous prime is 28746623. The next prime is 28746649. The reversal of 28746644 is 44664782.

28746644 = T₄₇₇ + T₄₇₈ + ... + T₆₅₄.

It can be written as a sum of positive squares in 2 ways, for example, as 17322244 + 11424400 = 4162^2 + 3380^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28746649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40019 + ... + 40730.

It is an arithmetic number, because the mean of its divisors is an integer number (4239375).

Almost surely, 2^28746644 is an apocalyptic number.

It is an amenable number.

28746644 is a deficient number, since it is larger than the sum of its proper divisors (22125856).

28746644 is a wasteful number, since it uses less digits than its factorization.

28746644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80842 (or 80840 counting only the distinct ones).

The product of its digits is 258048, while the sum is 41.

The square root of 28746644 is about 5361.5896896350. The cubic root of 28746644 is about 306.3343633193.

The spelling of 28746644 in words is "twenty-eight million, seven hundred forty-six thousand, six hundred forty-four".