28071707 has 8 divisors (see below), whose sum is σ = 29347584. Its totient is φ = 26800488.

The previous prime is 28071691. The next prime is 28071713. The reversal of 28071707 is 70717082.

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 28071707 - 2⁴ = 28071691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28071107) 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, 18188 + ... + 19670.

It is an arithmetic number, because the mean of its divisors is an integer number (3668448).

Almost surely, 2^28071707 is an apocalyptic number.

28071707 is a deficient number, since it is larger than the sum of its proper divisors (1275877).

28071707 is a wasteful number, since it uses less digits than its factorization.

28071707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2329.

The product of its (nonzero) digits is 5488, while the sum is 32.

The square root of 28071707 is about 5298.2739642265. The cubic root of 28071707 is about 303.9178960812.

Adding to 28071707 its reverse (70717082), we get a palindrome (98788789).

The spelling of 28071707 in words is "twenty-eight million, seventy-one thousand, seven hundred seven".