28196957 has 4 divisors (see below), whose sum is σ = 28225596. Its totient is φ = 28168320.

The previous prime is 28196953. The next prime is 28196963. The reversal of 28196957 is 75969182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5262436 + 22934521 = 2294^2 + 4789^2 .

It is a cyclic number.

It is not a de Polignac number, because 28196957 - 2² = 28196953 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28196953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12788 + ... + 14829.

It is an arithmetic number, because the mean of its divisors is an integer number (7056399).

Almost surely, 2^28196957 is an apocalyptic number.

It is an amenable number.

28196957 is a deficient number, since it is larger than the sum of its proper divisors (28639).

28196957 is a wasteful number, since it uses less digits than its factorization.

28196957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28638.

The product of its digits is 272160, while the sum is 47.

The square root of 28196957 is about 5310.0806961853. The cubic root of 28196957 is about 304.3692312124.

The spelling of 28196957 in words is "twenty-eight million, one hundred ninety-six thousand, nine hundred fifty-seven".