642609132 has 24 divisors (see below), whose sum is σ = 1635732672. Its totient is φ = 194730000.

The previous prime is 642609119. The next prime is 642609139. The reversal of 642609132 is 231906246.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 642609093 and 642609102.

It is not an unprimeable number, because it can be changed into a prime (642609139) 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, 2433994 + ... + 2434257.

It is an arithmetic number, because the mean of its divisors is an integer number (68155528).

Almost surely, 2^642609132 is an apocalyptic number.

It is an amenable number.

642609132 is an abundant number, since it is smaller than the sum of its proper divisors (993123540).

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

642609132 is a wasteful number, since it uses less digits than its factorization.

642609132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4868269 (or 4868267 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 642609132 is about 25349.7363299897. The cubic root of 642609132 is about 862.9433724632.

The spelling of 642609132 in words is "six hundred forty-two million, six hundred nine thousand, one hundred thirty-two".