646142140 has 48 divisors (see below), whose sum is σ = 1552320000. Its totient is φ = 221308992.

The previous prime is 646142117. The next prime is 646142183. The reversal of 646142140 is 41241646.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 646142099 and 646142108.

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, 194211 + ... + 197509.

It is an arithmetic number, because the mean of its divisors is an integer number (32340000).

Almost surely, 2^646142140 is an apocalyptic number.

It is an amenable number.

646142140 is an abundant number, since it is smaller than the sum of its proper divisors (906177860).

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

646142140 is a wasteful number, since it uses less digits than its factorization.

646142140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4714 (or 4712 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 646142140 is about 25419.3261122320. The cubic root of 646142140 is about 864.5219450731.

Adding to 646142140 its reverse (41241646), we get a palindrome (687383786).

The spelling of 646142140 in words is "six hundred forty-six million, one hundred forty-two thousand, one hundred forty".