28451986 has 16 divisors (see below), whose sum is σ = 44782848. Its totient is φ = 13539600.

The previous prime is 28451981. The next prime is 28451993. The reversal of 28451986 is 68915482.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28451981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21 + ... + 7543.

It is an arithmetic number, because the mean of its divisors is an integer number (2798928).

Almost surely, 2^28451986 is an apocalyptic number.

28451986 is a deficient number, since it is larger than the sum of its proper divisors (16330862).

28451986 is a wasteful number, since it uses less digits than its factorization.

28451986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7617.

The product of its digits is 138240, while the sum is 43.

The square root of 28451986 is about 5334.0403073093. The cubic root of 28451986 is about 305.2841068576.

The spelling of 28451986 in words is "twenty-eight million, four hundred fifty-one thousand, nine hundred eighty-six".