642254220 has 72 divisors (see below), whose sum is σ = 2062779264. Its totient is φ = 161192448.

The previous prime is 642254209. The next prime is 642254227. The reversal of 642254220 is 22452246.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (642254227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 101884 + ... + 108003.

It is an arithmetic number, because the mean of its divisors is an integer number (28649712).

Almost surely, 2^642254220 is an apocalyptic number.

642254220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

642254220 is an abundant number, since it is smaller than the sum of its proper divisors (1420525044).

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

642254220 is a wasteful number, since it uses less digits than its factorization.

642254220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209919 (or 209914 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 642254220 is about 25342.7350536599. The cubic root of 642254220 is about 862.7844757901.

The spelling of 642254220 in words is "six hundred forty-two million, two hundred fifty-four thousand, two hundred twenty".