642040452 has 24 divisors (see below), whose sum is σ = 1664549600. Its totient is φ = 214013448.

The previous prime is 642040447. The next prime is 642040453. The reversal of 642040452 is 254040246.

642040452 is a `hidden beast` number, since 6 + 4 + 204 + 0 + 452 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (642040453) 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, 2972302 + ... + 2972517.

Almost surely, 2^642040452 is an apocalyptic number.

It is an amenable number.

642040452 is an abundant number, since it is smaller than the sum of its proper divisors (1022509148).

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

642040452 is a wasteful number, since it uses less digits than its factorization.

642040452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5944832 (or 5944824 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 642040452 is about 25338.5171626123. The cubic root of 642040452 is about 862.6887420591.

Adding to 642040452 its reverse (254040246), we get a palindrome (896080698).

The spelling of 642040452 in words is "six hundred forty-two million, forty thousand, four hundred fifty-two".