28263697 has 16 divisors (see below), whose sum is σ = 37094400. Its totient is φ = 20863440.

The previous prime is 28263691. The next prime is 28263709. The reversal of 28263697 is 79636282.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28263697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28263691) 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, 8197 + ... + 11122.

It is an arithmetic number, because the mean of its divisors is an integer number (2318400).

Almost surely, 2^28263697 is an apocalyptic number.

It is an amenable number.

28263697 is a deficient number, since it is larger than the sum of its proper divisors (8830703).

28263697 is a wasteful number, since it uses less digits than its factorization.

28263697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19356.

The product of its digits is 217728, while the sum is 43.

The square root of 28263697 is about 5316.3612555958. The cubic root of 28263697 is about 304.6091814149.

The spelling of 28263697 in words is "twenty-eight million, two hundred sixty-three thousand, six hundred ninety-seven".