642091460 has 48 divisors (see below), whose sum is σ = 1424908800. Its totient is φ = 242546304.

The previous prime is 642091427. The next prime is 642091469. The reversal of 642091460 is 64190246.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (642091469) 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, 27506 + ... + 45174.

It is an arithmetic number, because the mean of its divisors is an integer number (29685600).

Almost surely, 2^642091460 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 642091460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (712454400).

642091460 is an abundant number, since it is smaller than the sum of its proper divisors (782817340).

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

642091460 is a wasteful number, since it uses less digits than its factorization.

642091460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17780 (or 17778 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 642091460 is about 25339.5236735026. The cubic root of 642091460 is about 862.7115873809.

The spelling of 642091460 in words is "six hundred forty-two million, ninety-one thousand, four hundred sixty".