642655302 has 8 divisors (see below), whose sum is σ = 1285310616. Its totient is φ = 214218432.

The previous prime is 642655289. The next prime is 642655303. The reversal of 642655302 is 203556246.

It is a sphenic number, since it is the product of 3 distinct primes.

642655302 is an admirable number.

It is a super-2 number, since 2×642655302² = 826011674377422408, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642655303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53554603 + ... + 53554614.

It is an arithmetic number, because the mean of its divisors is an integer number (160663827).

Almost surely, 2^642655302 is an apocalyptic number.

642655302 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

642655302 is a wasteful number, since it uses less digits than its factorization.

642655302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107109222.

The product of its (nonzero) digits is 43200, while the sum is 33.

The square root of 642655302 is about 25350.6469739926. The cubic root of 642655302 is about 862.9640388057.

The spelling of 642655302 in words is "six hundred forty-two million, six hundred fifty-five thousand, three hundred two".