28451405 has 8 divisors (see below), whose sum is σ = 34264032. Its totient is φ = 22679568.

The previous prime is 28451399. The next prime is 28451411. The reversal of 28451405 is 50415482.

It is an interprime number because it is at equal distance from previous prime (28451399) and next prime (28451411).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28451405 - 2¹⁴ = 28435021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8639 + ... + 11468.

It is an arithmetic number, because the mean of its divisors is an integer number (4283004).

Almost surely, 2^28451405 is an apocalyptic number.

It is an amenable number.

28451405 is a deficient number, since it is larger than the sum of its proper divisors (5812627).

28451405 is a wasteful number, since it uses less digits than its factorization.

28451405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20395.

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 28451405 is about 5333.9858455005. The cubic root of 28451405 is about 305.2820288389.

Adding to 28451405 its reverse (50415482), we get a palindrome (78866887).

The spelling of 28451405 in words is "twenty-eight million, four hundred fifty-one thousand, four hundred five".