28775475 has 36 divisors (see below), whose sum is σ = 54579096. Its totient is φ = 14442240.

The previous prime is 28775459. The next prime is 28775477. The reversal of 28775475 is 57457782.

It is not a de Polignac number, because 28775475 - 2⁴ = 28775459 is a prime.

It is a super-2 number, since 2×28775475² = 1656055922951250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 28775475.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28775477) 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 35 ways as a sum of consecutive naturals, for example, 64 + ... + 7586.

It is an arithmetic number, because the mean of its divisors is an integer number (1516086).

Almost surely, 2^28775475 is an apocalyptic number.

28775475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28775475 is a deficient number, since it is larger than the sum of its proper divisors (25803621).

28775475 is a wasteful number, since it uses less digits than its factorization.

28775475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7556 (or 7548 counting only the distinct ones).

The product of its digits is 548800, while the sum is 45.

The square root of 28775475 is about 5364.2776773765. The cubic root of 28775475 is about 306.4367401980.

The spelling of 28775475 in words is "twenty-eight million, seven hundred seventy-five thousand, four hundred seventy-five".