28937945 has 8 divisors (see below), whose sum is σ = 34783560. Its totient is φ = 23111680.

The previous prime is 28937939. The next prime is 28937971. The reversal of 28937945 is 54973982.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18524416 + 10413529 = 4304^2 + 3227^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28937945 - 2⁴ = 28937929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28937945.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1310 + ... + 7719.

It is an arithmetic number, because the mean of its divisors is an integer number (4347945).

Almost surely, 2^28937945 is an apocalyptic number.

It is an amenable number.

28937945 is a deficient number, since it is larger than the sum of its proper divisors (5845615).

28937945 is an equidigital number, since it uses as much as digits as its factorization.

28937945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9675.

The product of its digits is 544320, while the sum is 47.

The square root of 28937945 is about 5379.4000594862. The cubic root of 28937945 is about 307.0123851313.

The spelling of 28937945 in words is "twenty-eight million, nine hundred thirty-seven thousand, nine hundred forty-five".