642851232 has 48 divisors (see below), whose sum is σ = 1688793120. Its totient is φ = 214117632.

The previous prime is 642851189. The next prime is 642851239. The reversal of 642851232 is 232158246.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 642851193 and 642851202.

It is not an unprimeable number, because it can be changed into a prime (642851239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 227943 + ... + 230745.

It is an arithmetic number, because the mean of its divisors is an integer number (35183190).

Almost surely, 2^642851232 is an apocalyptic number.

It is an amenable number.

642851232 is an abundant number, since it is smaller than the sum of its proper divisors (1045941888).

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

642851232 is a wasteful number, since it uses less digits than its factorization.

642851232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5205 (or 5197 counting only the distinct ones).

The product of its digits is 23040, while the sum is 33.

The square root of 642851232 is about 25354.5110779127. The cubic root of 642851232 is about 863.0517288233.

The spelling of 642851232 in words is "six hundred forty-two million, eight hundred fifty-one thousand, two hundred thirty-two".