642692876 has 48 divisors (see below), whose sum is σ = 1334948160. Its totient is φ = 265006080.

The previous prime is 642692873. The next prime is 642692909. The reversal of 642692876 is 678296246.

It is a happy number.

642692876 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×642692876² = 826108265722302752, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (642692873) 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, 79970 + ... + 87638.

It is an arithmetic number, because the mean of its divisors is an integer number (27811420).

Almost surely, 2^642692876 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642692876, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (667474080).

642692876 is an abundant number, since it is smaller than the sum of its proper divisors (692255284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642692876 is a wasteful number, since it uses less digits than its factorization.

642692876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7794 (or 7792 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 50.

The square root of 642692876 is about 25351.3880487834. The cubic root of 642692876 is about 862.9808567270.

The spelling of 642692876 in words is "six hundred forty-two million, six hundred ninety-two thousand, eight hundred seventy-six".