642719272 has 32 divisors (see below), whose sum is σ = 1374143400. Its totient is φ = 279189504.

The previous prime is 642719261. The next prime is 642719317. The reversal of 642719272 is 272917246.

It can be written as a sum of positive squares in 4 ways, for example, as 456505956 + 186213316 = 21366^2 + 13646^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179997 + ... + 183532.

Almost surely, 2^642719272 is an apocalyptic number.

It is an amenable number.

642719272 is an abundant number, since it is smaller than the sum of its proper divisors (731424128).

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

642719272 is a wasteful number, since it uses less digits than its factorization.

642719272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363565 (or 363561 counting only the distinct ones).

The product of its digits is 84672, while the sum is 40.

The square root of 642719272 is about 25351.9086460961. The cubic root of 642719272 is about 862.9926710434.

The spelling of 642719272 in words is "six hundred forty-two million, seven hundred nineteen thousand, two hundred seventy-two".