857648442 has 32 divisors (see below), whose sum is σ = 1978670592. Its totient is φ = 242751024.

The previous prime is 857648431. The next prime is 857648503. The reversal of 857648442 is 244846758.

It is a junction number, because it is equal to n+sod(n) for n = 857648391 and 857648400.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90928 + ... + 99915.

It is an arithmetic number, because the mean of its divisors is an integer number (61833456).

Almost surely, 2^857648442 is an apocalyptic number.

857648442 is an abundant number, since it is smaller than the sum of its proper divisors (1121022150).

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

857648442 is a wasteful number, since it uses less digits than its factorization.

857648442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190962.

The product of its digits is 1720320, while the sum is 48.

The square root of 857648442 is about 29285.6354207997. The cubic root of 857648442 is about 950.1009835404.

The spelling of 857648442 in words is "eight hundred fifty-seven million, six hundred forty-eight thousand, four hundred forty-two".