28470505 has 8 divisors (see below), whose sum is σ = 39045312. Its totient is φ = 19522608.

The previous prime is 28470499. The next prime is 28470613. The reversal of 28470505 is 50507482.

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

It is a de Polignac number, because none of the positive numbers 2^k-28470505 is a prime.

It is a Duffinian number.

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, 406687 + ... + 406756.

It is an arithmetic number, because the mean of its divisors is an integer number (4880664).

Almost surely, 2^28470505 is an apocalyptic number.

It is an amenable number.

28470505 is a deficient number, since it is larger than the sum of its proper divisors (10574807).

28470505 is an equidigital number, since it uses as much as digits as its factorization.

28470505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813455.

The product of its (nonzero) digits is 11200, while the sum is 31.

The square root of 28470505 is about 5335.7759510684. The cubic root of 28470505 is about 305.3503275450.

Adding to 28470505 its reverse (50507482), we get a palindrome (78977987).

The spelling of 28470505 in words is "twenty-eight million, four hundred seventy thousand, five hundred five".