28646537 has 4 divisors (see below), whose sum is σ = 28991760. Its totient is φ = 28301316.

The previous prime is 28646531. The next prime is 28646539. The reversal of 28646537 is 73564682.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 28646537 - 2¹² = 28642441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28646494 and 28646503.

It is not an unprimeable number, because it can be changed into a prime (28646531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172487 + ... + 172652.

It is an arithmetic number, because the mean of its divisors is an integer number (7247940).

Almost surely, 2^28646537 is an apocalyptic number.

It is an amenable number.

28646537 is a deficient number, since it is larger than the sum of its proper divisors (345223).

28646537 is an equidigital number, since it uses as much as digits as its factorization.

28646537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345222.

The product of its digits is 241920, while the sum is 41.

The square root of 28646537 is about 5352.2459771576. The cubic root of 28646537 is about 305.9783579323.

The spelling of 28646537 in words is "twenty-eight million, six hundred forty-six thousand, five hundred thirty-seven".