28670997 has 8 divisors (see below), whose sum is σ = 38329344. Its totient is φ = 19063328.

The previous prime is 28670989. The next prime is 28671011. The reversal of 28670997 is 79907682.

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

It is a cyclic number.

It is not a de Polignac number, because 28670997 - 2³ = 28670989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28670947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11328 + ... + 13625.

It is an arithmetic number, because the mean of its divisors is an integer number (4791168).

Almost surely, 2^28670997 is an apocalyptic number.

It is an amenable number.

28670997 is a deficient number, since it is larger than the sum of its proper divisors (9658347).

28670997 is a wasteful number, since it uses less digits than its factorization.

28670997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25339.

The product of its (nonzero) digits is 381024, while the sum is 48.

The square root of 28670997 is about 5354.5305116322. The cubic root of 28670997 is about 306.0654202474.

The spelling of 28670997 in words is "twenty-eight million, six hundred seventy thousand, nine hundred ninety-seven".