8157705 has 16 divisors (see below), whose sum is σ = 13820544. Its totient is φ = 4094720.

The previous prime is 8157701. The next prime is 8157727. The reversal of 8157705 is 5077518.

8157705 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8157705 - 2² = 8157701 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8157701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15741 + ... + 16250.

It is an arithmetic number, because the mean of its divisors is an integer number (863784).

Almost surely, 2^8157705 is an apocalyptic number.

8157705 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

8157705 is a deficient number, since it is larger than the sum of its proper divisors (5662839).

8157705 is a wasteful number, since it uses less digits than its factorization.

8157705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32016.

The product of its (nonzero) digits is 9800, while the sum is 33.

The square root of 8157705 is about 2856.1696378192. The cubic root of 8157705 is about 201.3056659665.

The spelling of 8157705 in words is "eight million, one hundred fifty-seven thousand, seven hundred five".