820458057 has 12 divisors (see below), whose sum is σ = 1154551920. Its totient is φ = 518183352.

The previous prime is 820458049. The next prime is 820458061. The reversal of 820458057 is 750854028.

It is not a de Polignac number, because 820458057 - 2³ = 820458049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (820458557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 377707 + ... + 379872.

It is an arithmetic number, because the mean of its divisors is an integer number (96212660).

Almost surely, 2^820458057 is an apocalyptic number.

It is an amenable number.

820458057 is a deficient number, since it is larger than the sum of its proper divisors (334093863).

820458057 is a wasteful number, since it uses less digits than its factorization.

820458057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757620 (or 757601 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 39.

The square root of 820458057 is about 28643.6390320783. The cubic root of 820458057 is about 936.1644131429.

The spelling of 820458057 in words is "eight hundred twenty million, four hundred fifty-eight thousand, fifty-seven".