820638485 has 16 divisors (see below), whose sum is σ = 1004814720. Its totient is φ = 643181760.

The previous prime is 820638463. The next prime is 820638517. The reversal of 820638485 is 584836028.

It is not a de Polignac number, because 820638485 - 2¹² = 820634389 is a prime.

It is a congruent number.

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, 220490 + ... + 224180.

It is an arithmetic number, because the mean of its divisors is an integer number (62800920).

Almost surely, 2^820638485 is an apocalyptic number.

It is an amenable number.

820638485 is a deficient number, since it is larger than the sum of its proper divisors (184176235).

820638485 is a wasteful number, since it uses less digits than its factorization.

820638485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4588.

The product of its (nonzero) digits is 368640, while the sum is 44.

The square root of 820638485 is about 28646.7883889276. The cubic root of 820638485 is about 936.2330324916.

The spelling of 820638485 in words is "eight hundred twenty million, six hundred thirty-eight thousand, four hundred eighty-five".