642516440 has 16 divisors (see below), whose sum is σ = 1445662080. Its totient is φ = 257006560.

The previous prime is 642516439. The next prime is 642516451. The reversal of 642516440 is 44615246.

642516440 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 642516397 and 642516406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8031416 + ... + 8031495.

It is an arithmetic number, because the mean of its divisors is an integer number (90353880).

Almost surely, 2^642516440 is an apocalyptic number.

It is an amenable number.

642516440 is an abundant number, since it is smaller than the sum of its proper divisors (803145640).

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

642516440 is a wasteful number, since it uses less digits than its factorization.

642516440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16062922 (or 16062918 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 642516440 is about 25347.9080004643. The cubic root of 642516440 is about 862.9018792292.

The spelling of 642516440 in words is "six hundred forty-two million, five hundred sixteen thousand, four hundred forty".