28051697 has 4 divisors (see below), whose sum is σ = 29271360. Its totient is φ = 26832036.

The previous prime is 28051693. The next prime is 28051711. The reversal of 28051697 is 79615082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79615082 = 2 ⋅39807541.

It is a cyclic number.

It is not a de Polignac number, because 28051697 - 2² = 28051693 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28051697.

It is not an unprimeable number, because it can be changed into a prime (28051691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 609797 + ... + 609842.

It is an arithmetic number, because the mean of its divisors is an integer number (7317840).

Almost surely, 2^28051697 is an apocalyptic number.

It is an amenable number.

28051697 is a deficient number, since it is larger than the sum of its proper divisors (1219663).

28051697 is a wasteful number, since it uses less digits than its factorization.

28051697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1219662.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 28051697 is about 5296.3852767713. The cubic root of 28051697 is about 303.8456662657.

The spelling of 28051697 in words is "twenty-eight million, fifty-one thousand, six hundred ninety-seven".