28061864 has 16 divisors (see below), whose sum is σ = 52744020. Its totient is φ = 13996800.

The previous prime is 28061833. The next prime is 28061881. The reversal of 28061864 is 46816082.

It can be written as a sum of positive squares in 2 ways, for example, as 27352900 + 708964 = 5230^2 + 842^2 .

It is a super-2 number, since 2×28061864² = 1574936422308992, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 587 + ... + 7514.

Almost surely, 2^28061864 is an apocalyptic number.

It is an amenable number.

28061864 is a deficient number, since it is larger than the sum of its proper divisors (24682156).

28061864 is a wasteful number, since it uses less digits than its factorization.

28061864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8540 (or 8536 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 28061864 is about 5297.3449953727. The cubic root of 28061864 is about 303.8823702335.

The spelling of 28061864 in words is "twenty-eight million, sixty-one thousand, eight hundred sixty-four".