2157707706 has 64 divisors (see below), whose sum is σ = 5565818880. Its totient is φ = 541114560.

The previous prime is 2157707701. The next prime is 2157707719. The reversal of 2157707706 is 6077077512.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (2157707701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67126 + ... + 93921.

It is an arithmetic number, because the mean of its divisors is an integer number (86965920).

Almost surely, 2^2157707706 is an apocalyptic number.

2157707706 is an abundant number, since it is smaller than the sum of its proper divisors (3408111174).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2157707706 is a wasteful number, since it uses less digits than its factorization.

2157707706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161099.

The product of its (nonzero) digits is 144060, while the sum is 42.

The square root of 2157707706 is about 46451.1324512116. The cubic root of 2157707706 is about 1292.2033745961.

The spelling of 2157707706 in words is "two billion, one hundred fifty-seven million, seven hundred seven thousand, seven hundred six".