28291697 has 16 divisors (see below), whose sum is σ = 33357312. Its totient is φ = 23493120.

The previous prime is 28291693. The next prime is 28291709. The reversal of 28291697 is 79619282.

It is a happy number.

It is not a de Polignac number, because 28291697 - 2² = 28291693 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28291693) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36797 + ... + 37557.

It is an arithmetic number, because the mean of its divisors is an integer number (2084832).

Almost surely, 2^28291697 is an apocalyptic number.

It is an amenable number.

28291697 is a deficient number, since it is larger than the sum of its proper divisors (5065615).

28291697 is a wasteful number, since it uses less digits than its factorization.

28291697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928.

The product of its digits is 108864, while the sum is 44.

The square root of 28291697 is about 5318.9939838281. The cubic root of 28291697 is about 304.7097372874.

The spelling of 28291697 in words is "twenty-eight million, two hundred ninety-one thousand, six hundred ninety-seven".