642787787246 has 32 divisors (see below), whose sum is σ = 1055771608320. Its totient is φ = 291083990400.

The previous prime is 642787787209. The next prime is 642787787273.

642787787246 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×642787787246² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9746201 + ... + 9811931.

It is an arithmetic number, because the mean of its divisors is an integer number (32992862760).

Almost surely, 2^642787787246 is an apocalyptic number.

642787787246 is a deficient number, since it is larger than the sum of its proper divisors (412983821074).

642787787246 is a wasteful number, since it uses less digits than its factorization.

642787787246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67400.

The product of its digits is 354041856, while the sum is 68.

The spelling of 642787787246 in words is "six hundred forty-two billion, seven hundred eighty-seven million, seven hundred eighty-seven thousand, two hundred forty-six".