28051397 has 8 divisors (see below), whose sum is σ = 30650400. Its totient is φ = 25460560.

The previous prime is 28051369. The next prime is 28051403. The reversal of 28051397 is 79315082.

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 28051397 - 2⁸ = 28051141 is a prime.

It is a super-3 number, since 3×28051397³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28051327) 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, 6854 + ... + 10152.

It is an arithmetic number, because the mean of its divisors is an integer number (3831300).

Almost surely, 2^28051397 is an apocalyptic number.

It is an amenable number.

28051397 is a deficient number, since it is larger than the sum of its proper divisors (2599003).

28051397 is a wasteful number, since it uses less digits than its factorization.

28051397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4083.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 28051397 is about 5296.3569554931. The cubic root of 28051397 is about 303.8445830986.

The spelling of 28051397 in words is "twenty-eight million, fifty-one thousand, three hundred ninety-seven".