642772 has 24 divisors (see below), whose sum is σ = 1241856. Its totient is φ = 289248.

The previous prime is 642769. The next prime is 642779. The reversal of 642772 is 277246.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 642772.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2313 + ... + 2575.

It is an arithmetic number, because the mean of its divisors is an integer number (51744).

2⁶⁴²⁷⁷² is an apocalyptic number.

It is an amenable number.

642772 is a deficient number, since it is larger than the sum of its proper divisors (599084).

642772 is a wasteful number, since it uses less digits than its factorization.

642772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327 (or 325 counting only the distinct ones).

The product of its digits is 4704, while the sum is 28.

The square root of 642772 is about 801.7306280790. The cubic root of 642772 is about 86.3016270063.

It can be divided in two parts, 6 and 42772, that added together give a triangular number (42778 = T₂₉₂).

The spelling of 642772 in words is "six hundred forty-two thousand, seven hundred seventy-two".