28451865 has 32 divisors (see below), whose sum is σ = 49875840. Its totient is φ = 13764096.

The previous prime is 28451837. The next prime is 28451869. The reversal of 28451865 is 56815482.

It is not a de Polignac number, because 28451865 - 2⁵ = 28451833 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (28451869) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10269 + ... + 12741.

It is an arithmetic number, because the mean of its divisors is an integer number (1558620).

Almost surely, 2^28451865 is an apocalyptic number.

It is an amenable number.

28451865 is a deficient number, since it is larger than the sum of its proper divisors (21423975).

28451865 is a wasteful number, since it uses less digits than its factorization.

28451865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2553.

The product of its digits is 76800, while the sum is 39.

The square root of 28451865 is about 5334.0289650507. The cubic root of 28451865 is about 305.2836740884.

The spelling of 28451865 in words is "twenty-eight million, four hundred fifty-one thousand, eight hundred sixty-five".