642147072 has 72 divisors (see below), whose sum is σ = 1953213696. Its totient is φ = 183469056.

The previous prime is 642147071. The next prime is 642147089. The reversal of 642147072 is 270741246.

It is not an unprimeable number, because it can be changed into a prime (642147071) 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, 54348 + ... + 65099.

It is an arithmetic number, because the mean of its divisors is an integer number (27127968).

Almost surely, 2^642147072 is an apocalyptic number.

It is an amenable number.

642147072 is an abundant number, since it is smaller than the sum of its proper divisors (1311066624).

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

642147072 is a wasteful number, since it uses less digits than its factorization.

642147072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119473 (or 119459 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 33.

The square root of 642147072 is about 25340.6209868661. The cubic root of 642147072 is about 862.7364933508.

The spelling of 642147072 in words is "six hundred forty-two million, one hundred forty-seven thousand, seventy-two".