642260420 has 48 divisors (see below), whose sum is σ = 1427328000. Its totient is φ = 242081280.

The previous prime is 642260389. The next prime is 642260429. The reversal of 642260420 is 24062246.

It is a self number, because there is not a number n which added to its sum of digits gives 642260420.

It is not an unprimeable number, because it can be changed into a prime (642260429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68156 + ... + 77004.

It is an arithmetic number, because the mean of its divisors is an integer number (29736000).

Almost surely, 2^642260420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642260420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (713664000).

642260420 is an abundant number, since it is smaller than the sum of its proper divisors (785067580).

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

642260420 is a wasteful number, since it uses less digits than its factorization.

642260420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9068 (or 9066 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 642260420 is about 25342.8573763891. The cubic root of 642260420 is about 862.7872520773.

The spelling of 642260420 in words is "six hundred forty-two million, two hundred sixty thousand, four hundred twenty".