28646337 has 4 divisors (see below), whose sum is σ = 38195120. Its totient is φ = 19097556.

The previous prime is 28646333. The next prime is 28646347. The reversal of 28646337 is 73364682.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28646337 - 2² = 28646333 is a prime.

It is a super-2 number, since 2×28646337² = 1641225247035138, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28646295 and 28646304.

It is not an unprimeable number, because it can be changed into a prime (28646333) 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 3 ways as a sum of consecutive naturals, for example, 4774387 + ... + 4774392.

It is an arithmetic number, because the mean of its divisors is an integer number (9548780).

Almost surely, 2^28646337 is an apocalyptic number.

It is an amenable number.

28646337 is a deficient number, since it is larger than the sum of its proper divisors (9548783).

28646337 is an equidigital number, since it uses as much as digits as its factorization.

28646337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9548782.

The product of its digits is 145152, while the sum is 39.

The square root of 28646337 is about 5352.2272933798. The cubic root of 28646337 is about 305.9776458530.

The spelling of 28646337 in words is "twenty-eight million, six hundred forty-six thousand, three hundred thirty-seven".