28643518 has 8 divisors (see below), whose sum is σ = 43408512. Its totient is φ = 14174016.

The previous prime is 28643471. The next prime is 28643519. The reversal of 28643518 is 81534682.

It is a happy number.

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

It is a super-2 number, since 2×28643518² = 1640902246832648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28643519) 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, 73630 + ... + 74017.

It is an arithmetic number, because the mean of its divisors is an integer number (5426064).

Almost surely, 2^28643518 is an apocalyptic number.

28643518 is a deficient number, since it is larger than the sum of its proper divisors (14764994).

28643518 is a wasteful number, since it uses less digits than its factorization.

28643518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147746.

The product of its digits is 46080, while the sum is 37.

The square root of 28643518 is about 5351.9639385930. The cubic root of 28643518 is about 305.9676087433.

It can be divided in two parts, 28643 and 518, that added together give a triangular number (29161 = T₂₄₁).

The spelling of 28643518 in words is "twenty-eight million, six hundred forty-three thousand, five hundred eighteen".