28553507 has 4 divisors (see below), whose sum is σ = 29249976. Its totient is φ = 27857040.

The previous prime is 28553501. The next prime is 28553513. The reversal of 28553507 is 70535582.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (28553501) and next prime (28553513).

It is not a de Polignac number, because 28553507 - 2⁶ = 28553443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28553501) 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, 348173 + ... + 348254.

It is an arithmetic number, because the mean of its divisors is an integer number (7312494).

Almost surely, 2^28553507 is an apocalyptic number.

28553507 is a deficient number, since it is larger than the sum of its proper divisors (696469).

28553507 is an equidigital number, since it uses as much as digits as its factorization.

28553507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696468.

The product of its (nonzero) digits is 42000, while the sum is 35.

The square root of 28553507 is about 5343.5481657790. The cubic root of 28553507 is about 305.6467758401.

The spelling of 28553507 in words is "twenty-eight million, five hundred fifty-three thousand, five hundred seven".