28430397 has 6 divisors (see below), whose sum is σ = 41066142. Its totient is φ = 18953592.

The previous prime is 28430371. The next prime is 28430399. The reversal of 28430397 is 79303482.

It can be written as a sum of positive squares in only one way, i.e., 27941796 + 488601 = 5286^2 + 699^2 .

It is not a de Polignac number, because 28430397 - 2⁶ = 28430333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28430399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1579458 + ... + 1579475.

It is an arithmetic number, because the mean of its divisors is an integer number (6844357).

Almost surely, 2^28430397 is an apocalyptic number.

It is an amenable number.

28430397 is a deficient number, since it is larger than the sum of its proper divisors (12635745).

28430397 is a wasteful number, since it uses less digits than its factorization.

28430397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3158939 (or 3158936 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 28430397 is about 5332.0162227810. The cubic root of 28430397 is about 305.2068721051.

The spelling of 28430397 in words is "twenty-eight million, four hundred thirty thousand, three hundred ninety-seven".