842639620 has 12 divisors (see below), whose sum is σ = 1769543244. Its totient is φ = 337055840.

The previous prime is 842639617. The next prime is 842639627. The reversal of 842639620 is 26936248.

It can be written as a sum of positive squares in 2 ways, for example, as 662650564 + 179989056 = 25742^2 + 13416^2 .

It is not an unprimeable number, because it can be changed into a prime (842639627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21065971 + ... + 21066010.

It is an arithmetic number, because the mean of its divisors is an integer number (147461937).

Almost surely, 2^842639620 is an apocalyptic number.

It is an amenable number.

842639620 is an abundant number, since it is smaller than the sum of its proper divisors (926903624).

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

842639620 is a wasteful number, since it uses less digits than its factorization.

842639620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42131990 (or 42131988 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 842639620 is about 29028.2555452442. The cubic root of 842639620 is about 944.5260895610.

The spelling of 842639620 in words is "eight hundred forty-two million, six hundred thirty-nine thousand, six hundred twenty".