28428491 has 8 divisors (see below), whose sum is σ = 34989024. Its totient is φ = 22492800.

The previous prime is 28428481. The next prime is 28428523. The reversal of 28428491 is 19482482.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28428491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28428451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156110 + ... + 156291.

It is an arithmetic number, because the mean of its divisors is an integer number (4373628).

Almost surely, 2^28428491 is an apocalyptic number.

28428491 is a deficient number, since it is larger than the sum of its proper divisors (6560533).

28428491 is a wasteful number, since it uses less digits than its factorization.

28428491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312421.

The product of its digits is 36864, while the sum is 38.

The square root of 28428491 is about 5331.8374881461. The cubic root of 28428491 is about 305.2000515028.

The spelling of 28428491 in words is "twenty-eight million, four hundred twenty-eight thousand, four hundred ninety-one".