28997605 has 32 divisors (see below), whose sum is σ = 43319808. Its totient is φ = 18144000.

The previous prime is 28997581. The next prime is 28997623. The reversal of 28997605 is 50679982.

It is not a de Polignac number, because 28997605 - 2¹³ = 28989413 is a prime.

It is a super-2 number, since 2×28997605² = 1681722191472050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45640 + ... + 46270.

It is an arithmetic number, because the mean of its divisors is an integer number (1353744).

Almost surely, 2^28997605 is an apocalyptic number.

It is an amenable number.

28997605 is a deficient number, since it is larger than the sum of its proper divisors (14322203).

28997605 is a wasteful number, since it uses less digits than its factorization.

28997605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 28997605 is about 5384.9424323757. The cubic root of 28997605 is about 307.2232246360.

The spelling of 28997605 in words is "twenty-eight million, nine hundred ninety-seven thousand, six hundred five".