820880457 has 16 divisors (see below), whose sum is σ = 1101609600. Its totient is φ = 543715200.

The previous prime is 820880447. The next prime is 820880497. The reversal of 820880457 is 754088028.

It is not a de Polignac number, because 820880457 - 2¹⁶ = 820814921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (820880447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 324357 + ... + 326877.

It is an arithmetic number, because the mean of its divisors is an integer number (68850600).

Almost surely, 2^820880457 is an apocalyptic number.

It is an amenable number.

820880457 is a deficient number, since it is larger than the sum of its proper divisors (280729143).

820880457 is a wasteful number, since it uses less digits than its factorization.

820880457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3184.

The product of its (nonzero) digits is 143360, while the sum is 42.

The square root of 820880457 is about 28651.0114481147. The cubic root of 820880457 is about 936.3250421163.

The spelling of 820880457 in words is "eight hundred twenty million, eight hundred eighty thousand, four hundred fifty-seven".