28321268 has 6 divisors (see below), whose sum is σ = 49562226. Its totient is φ = 14160632.

The previous prime is 28321253. The next prime is 28321301. The reversal of 28321268 is 86212382.

It can be written as a sum of positive squares in only one way, i.e., 16224784 + 12096484 = 4028^2 + 3478^2 .

It is a super-2 number, since 2×28321268² = 1604188442255648, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3540155 + ... + 3540162.

It is an arithmetic number, because the mean of its divisors is an integer number (8260371).

Almost surely, 2^28321268 is an apocalyptic number.

It is an amenable number.

28321268 is a deficient number, since it is larger than the sum of its proper divisors (21240958).

28321268 is a wasteful number, since it uses less digits than its factorization.

28321268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7080321 (or 7080319 counting only the distinct ones).

The product of its digits is 9216, while the sum is 32.

The square root of 28321268 is about 5321.7730128219. The cubic root of 28321268 is about 304.8158630543.

The spelling of 28321268 in words is "twenty-eight million, three hundred twenty-one thousand, two hundred sixty-eight".