857809056 has 96 divisors (see below), whose sum is σ = 2452524480. Its totient is φ = 260941824.

The previous prime is 857809033. The next prime is 857809061. The reversal of 857809056 is 650908758.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×857809056² = 1471672753111222272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 857808996 and 857809014.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107211 + ... + 114933.

It is an arithmetic number, because the mean of its divisors is an integer number (25547130).

Almost surely, 2^857809056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 857809056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1226262240).

857809056 is an abundant number, since it is smaller than the sum of its proper divisors (1594715424).

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

857809056 is a wasteful number, since it uses less digits than its factorization.

857809056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7838 (or 7830 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 48.

The square root of 857809056 is about 29288.3774900557. The cubic root of 857809056 is about 950.1602891125.

The spelling of 857809056 in words is "eight hundred fifty-seven million, eight hundred nine thousand, fifty-six".