642759252 has 24 divisors (see below), whose sum is σ = 1500945600. Its totient is φ = 214085376.

The previous prime is 642759209. The next prime is 642759259. The reversal of 642759252 is 252957246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642759259) 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, 4477 + ... + 36132.

It is an arithmetic number, because the mean of its divisors is an integer number (62539400).

Almost surely, 2^642759252 is an apocalyptic number.

It is an amenable number.

642759252 is an abundant number, since it is smaller than the sum of its proper divisors (858186348).

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

642759252 is a wasteful number, since it uses less digits than its factorization.

642759252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41935 (or 41933 counting only the distinct ones).

The product of its digits is 302400, while the sum is 42.

The square root of 642759252 is about 25352.6971346246. The cubic root of 642759252 is about 863.0105646677.

The spelling of 642759252 in words is "six hundred forty-two million, seven hundred fifty-nine thousand, two hundred fifty-two".