1002020578858 has 16 divisors (see below), whose sum is σ = 1625365021896. Its totient is φ = 460552066560.

The previous prime is 1002020578843. The next prime is 1002020578859. The reversal of 1002020578858 is 8588750202001.

It can be written as a sum of positive squares in 4 ways, for example, as 943002192889 + 59018385969 = 971083^2 + 242937^2 .

It is not an unprimeable number, because it can be changed into a prime (1002020578859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79950691 + ... + 79963222.

Almost surely, 2^{1002020578858} is an apocalyptic number.

1002020578858 is a deficient number, since it is larger than the sum of its proper divisors (623344443038).

1002020578858 is a wasteful number, since it uses less digits than its factorization.

1002020578858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159914169.

The product of its (nonzero) digits is 358400, while the sum is 46.

The spelling of 1002020578858 in words is "one trillion, two billion, twenty million, five hundred seventy-eight thousand, eight hundred fifty-eight".