857306720 has 48 divisors (see below), whose sum is σ = 2074802688. Its totient is φ = 334556160.

The previous prime is 857306713. The next prime is 857306731. The reversal of 857306720 is 27603758.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58784 + ... + 71903.

It is an arithmetic number, because the mean of its divisors is an integer number (43225056).

Almost surely, 2^857306720 is an apocalyptic number.

857306720 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

857306720 is an abundant number, since it is smaller than the sum of its proper divisors (1217495968).

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

857306720 is a wasteful number, since it uses less digits than its factorization.

857306720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130743 (or 130735 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 857306720 is about 29279.8005457688. The cubic root of 857306720 is about 949.9747804939.

The spelling of 857306720 in words is "eight hundred fifty-seven million, three hundred six thousand, seven hundred twenty".