28001386 has 16 divisors (see below), whose sum is σ = 48072960. Its totient is φ = 11982960.

The previous prime is 28001359. The next prime is 28001399. The reversal of 28001386 is 68310082.

28001386 is a nontrivial binomial coefficient, being equal to C(7484, 2).

28001386 is a modest number, since divided by 1386 gives 28 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14031 + ... + 15901.

It is an arithmetic number, because the mean of its divisors is an integer number (3004560).

Almost surely, 2^28001386 is an apocalyptic number.

28001386 is the 7483-rd triangular number and also the 3742-nd hexagonal number.

28001386 is the 2495-th centered nonagonal number.

28001386 is a deficient number, since it is larger than the sum of its proper divisors (20071574).

28001386 is a wasteful number, since it uses less digits than its factorization.

28001386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2949.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 28001386 is about 5291.6335851984. The cubic root of 28001386 is about 303.6639074767.

It can be divided in two parts, 2800 and 1386, that added together give a triangular number (4186 = T₉₁).

The spelling of 28001386 in words is "twenty-eight million, one thousand, three hundred eighty-six".