642429252 has 48 divisors (see below), whose sum is σ = 1763536320. Its totient is φ = 201545856.

The previous prime is 642429241. The next prime is 642429301. The reversal of 642429252 is 252924246.

It is a happy number.

642429252 is a `hidden beast` number, since 642 + 4 + 2 + 9 + 2 + 5 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 173118 + ... + 176789.

It is an arithmetic number, because the mean of its divisors is an integer number (36740340).

Almost surely, 2^642429252 is an apocalyptic number.

It is an amenable number.

642429252 is an abundant number, since it is smaller than the sum of its proper divisors (1121107068).

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

642429252 is a wasteful number, since it uses less digits than its factorization.

642429252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349937 (or 349929 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 642429252 is about 25346.1881157700. The cubic root of 642429252 is about 862.8628461982.

The spelling of 642429252 in words is "six hundred forty-two million, four hundred twenty-nine thousand, two hundred fifty-two".