28071399 has 8 divisors (see below), whose sum is σ = 38636032. Its totient is φ = 18110520.

The previous prime is 28071383. The next prime is 28071409. The reversal of 28071399 is 99317082.

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

It is not a de Polignac number, because 28071399 - 2⁴ = 28071383 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 (28071319) 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, 150829 + ... + 151014.

It is an arithmetic number, because the mean of its divisors is an integer number (4829504).

Almost surely, 2^28071399 is an apocalyptic number.

28071399 is a deficient number, since it is larger than the sum of its proper divisors (10564633).

28071399 is a wasteful number, since it uses less digits than its factorization.

28071399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301877.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 28071399 is about 5298.2448980771. The cubic root of 28071399 is about 303.9167845580.

The spelling of 28071399 in words is "twenty-eight million, seventy-one thousand, three hundred ninety-nine".