28553506 has 8 divisors (see below), whose sum is σ = 45349740. Its totient is φ = 13436928.

The previous prime is 28553501. The next prime is 28553513. The reversal of 28553506 is 60535582.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 28526281 + 27225 = 5341^2 + 165^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (34), and also a Moran number because the ratio is a prime number: 839809 = 28553506 / (2 + 8 + 5 + 5 + 3 + 5 + 0 + 6).

It is not an unprimeable number, because it can be changed into a prime (28553501) 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, 419871 + ... + 419938.

Almost surely, 2^28553506 is an apocalyptic number.

28553506 is a deficient number, since it is larger than the sum of its proper divisors (16796234).

28553506 is a wasteful number, since it uses less digits than its factorization.

28553506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839828.

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 28553506 is about 5343.5480722082. The cubic root of 28553506 is about 305.6467722720.

The spelling of 28553506 in words is "twenty-eight million, five hundred fifty-three thousand, five hundred six".