28274397 has 8 divisors (see below), whose sum is σ = 37850400. Its totient is φ = 18774000.

The previous prime is 28274381. The next prime is 28274431. The reversal of 28274397 is 79347282.

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

It is not a de Polignac number, because 28274397 - 2⁴ = 28274381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28274347) 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, 18022 + ... + 19527.

It is an arithmetic number, because the mean of its divisors is an integer number (4731300).

Almost surely, 2^28274397 is an apocalyptic number.

It is an amenable number.

28274397 is a deficient number, since it is larger than the sum of its proper divisors (9576003).

28274397 is a wasteful number, since it uses less digits than its factorization.

28274397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37803.

The product of its digits is 169344, while the sum is 42.

The square root of 28274397 is about 5317.3674877706. The cubic root of 28274397 is about 304.6476159602.

The spelling of 28274397 in words is "twenty-eight million, two hundred seventy-four thousand, three hundred ninety-seven".