28800397 has 4 divisors (see below), whose sum is σ = 30494556. Its totient is φ = 27106240.

The previous prime is 28800377. The next prime is 28800403. The reversal of 28800397 is 79300882.

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 10361961 + 18438436 = 3219^2 + 4294^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28800397 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 (28800337) 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, 847054 + ... + 847087.

It is an arithmetic number, because the mean of its divisors is an integer number (7623639).

Almost surely, 2^28800397 is an apocalyptic number.

It is an amenable number.

28800397 is a deficient number, since it is larger than the sum of its proper divisors (1694159).

28800397 is a wasteful number, since it uses less digits than its factorization.

28800397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1694158.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 28800397 is about 5366.6001341632. The cubic root of 28800397 is about 306.5251813993.

The spelling of 28800397 in words is "twenty-eight million, eight hundred thousand, three hundred ninety-seven".