28569455 has 4 divisors (see below), whose sum is σ = 34283352. Its totient is φ = 22855560.

The previous prime is 28569449. The next prime is 28569461. The reversal of 28569455 is 55496582.

28569455 = T₃₃₇₈ + T₃₃₇₉ + ... + T₃₃₈₂.

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 (28569449) and next prime (28569461).

It is not a de Polignac number, because 28569455 - 2⁶ = 28569391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2856941 + ... + 2856950.

It is an arithmetic number, because the mean of its divisors is an integer number (8570838).

Almost surely, 2^28569455 is an apocalyptic number.

28569455 is a deficient number, since it is larger than the sum of its proper divisors (5713897).

28569455 is an equidigital number, since it uses as much as digits as its factorization.

28569455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5713896.

The product of its digits is 432000, while the sum is 44.

The square root of 28569455 is about 5345.0402243575. The cubic root of 28569455 is about 305.7036695817.

The spelling of 28569455 in words is "twenty-eight million, five hundred sixty-nine thousand, four hundred fifty-five".