28423945 has 16 divisors (see below), whose sum is σ = 37324800. Its totient is φ = 20608000.

The previous prime is 28423921. The next prime is 28423961. The reversal of 28423945 is 54932482.

It is a happy number.

It is not a de Polignac number, because 28423945 - 2¹³ = 28415753 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 24120 + ... + 25270.

It is an arithmetic number, because the mean of its divisors is an integer number (2332800).

Almost surely, 2^28423945 is an apocalyptic number.

It is an amenable number.

28423945 is a deficient number, since it is larger than the sum of its proper divisors (8900855).

28423945 is a wasteful number, since it uses less digits than its factorization.

28423945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616.

The product of its digits is 69120, while the sum is 37.

The square root of 28423945 is about 5331.4111640353. The cubic root of 28423945 is about 305.1837824555.

The spelling of 28423945 in words is "twenty-eight million, four hundred twenty-three thousand, nine hundred forty-five".