28420375 has 8 divisors (see below), whose sum is σ = 35468784. Its totient is φ = 22736200.

The previous prime is 28420369. The next prime is 28420411. The reversal of 28420375 is 57302482.

It is not a de Polignac number, because 28420375 - 2⁷ = 28420247 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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113557 + ... + 113806.

It is an arithmetic number, because the mean of its divisors is an integer number (4433598).

Almost surely, 2^28420375 is an apocalyptic number.

28420375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28420375 is a deficient number, since it is larger than the sum of its proper divisors (7048409).

28420375 is an equidigital number, since it uses as much as digits as its factorization.

28420375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227378 (or 227368 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 28420375 is about 5331.0763453547. The cubic root of 28420375 is about 305.1710050628.

The spelling of 28420375 in words is "twenty-eight million, four hundred twenty thousand, three hundred seventy-five".