28405897 has 8 divisors (see below), whose sum is σ = 31921344. Its totient is φ = 25080528.

The previous prime is 28405879. The next prime is 28405903. The reversal of 28405897 is 79850482.

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 28405897 - 2¹¹ = 28403849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28405697) by changing a digit.

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, 47203 + ... + 47800.

It is an arithmetic number, because the mean of its divisors is an integer number (3990168).

Almost surely, 2^28405897 is an apocalyptic number.

It is an amenable number.

28405897 is a deficient number, since it is larger than the sum of its proper divisors (3515447).

28405897 is a wasteful number, since it uses less digits than its factorization.

28405897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95039.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 28405897 is about 5329.7182852380. The cubic root of 28405897 is about 305.1191758583.

The spelling of 28405897 in words is "twenty-eight million, four hundred five thousand, eight hundred ninety-seven".