28390397 has 8 divisors (see below), whose sum is σ = 33136896. Its totient is φ = 23816592.

The previous prime is 28390361. The next prime is 28390403. The reversal of 28390397 is 79309382.

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

It is not a de Polignac number, because 28390397 - 2¹⁰ = 28389373 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 (28390337) 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, 42818 + ... + 43475.

It is an arithmetic number, because the mean of its divisors is an integer number (4142112).

Almost surely, 2^28390397 is an apocalyptic number.

It is an amenable number.

28390397 is a deficient number, since it is larger than the sum of its proper divisors (4746499).

28390397 is an equidigital number, since it uses as much as digits as its factorization.

28390397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86347.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 28390397 is about 5328.2639761934. The cubic root of 28390397 is about 305.0636685143.

The spelling of 28390397 in words is "twenty-eight million, three hundred ninety thousand, three hundred ninety-seven".