642237132 has 24 divisors (see below), whose sum is σ = 1550228400. Its totient is φ = 206696896.

The previous prime is 642237109. The next prime is 642237133. The reversal of 642237132 is 231732246.

It is a self number, because there is not a number n which added to its sum of digits gives 642237132.

It is not an unprimeable number, because it can be changed into a prime (642237133) 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, 922407 + ... + 923102.

It is an arithmetic number, because the mean of its divisors is an integer number (64592850).

Almost surely, 2^642237132 is an apocalyptic number.

It is an amenable number.

642237132 is an abundant number, since it is smaller than the sum of its proper divisors (907991268).

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

642237132 is a wasteful number, since it uses less digits than its factorization.

642237132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1845545 (or 1845543 counting only the distinct ones).

The product of its digits is 12096, while the sum is 30.

The square root of 642237132 is about 25342.3979133783. The cubic root of 642237132 is about 862.7768238918.

Adding to 642237132 its reverse (231732246), we get a palindrome (873969378).

The spelling of 642237132 in words is "six hundred forty-two million, two hundred thirty-seven thousand, one hundred thirty-two".