857637745 has 4 divisors (see below), whose sum is σ = 1029165300. Its totient is φ = 686110192.

The previous prime is 857637719. The next prime is 857637769. The reversal of 857637745 is 547736758.

857637745 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 605209201 + 252428544 = 24601^2 + 15888^2 .

It is a cyclic number.

It is not a de Polignac number, because 857637745 - 2⁷ = 857637617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 857637692 and 857637701.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85763770 + ... + 85763779.

It is an arithmetic number, because the mean of its divisors is an integer number (257291325).

Almost surely, 2^857637745 is an apocalyptic number.

It is an amenable number.

857637745 is a deficient number, since it is larger than the sum of its proper divisors (171527555).

857637745 is a wasteful number, since it uses less digits than its factorization.

857637745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171527554.

The product of its digits is 4939200, while the sum is 52.

The square root of 857637745 is about 29285.4527880311. The cubic root of 857637745 is about 950.0970334866.

The spelling of 857637745 in words is "eight hundred fifty-seven million, six hundred thirty-seven thousand, seven hundred forty-five".