820857538 has 16 divisors (see below), whose sum is σ = 1268628480. Its totient is φ = 398136256.

The previous prime is 820857517. The next prime is 820857547. The reversal of 820857538 is 835758028.

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, 28018 + ... + 49261.

It is an arithmetic number, because the mean of its divisors is an integer number (79289280).

Almost surely, 2^820857538 is an apocalyptic number.

820857538 is a deficient number, since it is larger than the sum of its proper divisors (447770942).

820857538 is a wasteful number, since it uses less digits than its factorization.

820857538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77441.

The product of its (nonzero) digits is 537600, while the sum is 46.

The square root of 820857538 is about 28650.6114768952. The cubic root of 820857538 is about 936.3163279634.

The spelling of 820857538 in words is "eight hundred twenty million, eight hundred fifty-seven thousand, five hundred thirty-eight".