28257995 has 8 divisors (see below), whose sum is σ = 35904384. Its totient is φ = 21276544.

The previous prime is 28257949. The next prime is 28258001. The reversal of 28257995 is 59975282.

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 28257995 - 2²² = 24063691 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166139 + ... + 166308.

It is an arithmetic number, because the mean of its divisors is an integer number (4488048).

Almost surely, 2^28257995 is an apocalyptic number.

28257995 is a deficient number, since it is larger than the sum of its proper divisors (7646389).

28257995 is a wasteful number, since it uses less digits than its factorization.

28257995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332469.

The product of its digits is 453600, while the sum is 47.

The square root of 28257995 is about 5315.8249594959. The cubic root of 28257995 is about 304.5886957914.

The spelling of 28257995 in words is "twenty-eight million, two hundred fifty-seven thousand, nine hundred ninety-five".