642516450 has 48 divisors (see below), whose sum is σ = 1595671680. Its totient is φ = 171097920.

The previous prime is 642516439. The next prime is 642516451. The reversal of 642516450 is 54615246.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (642516451) 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, 121767 + ... + 126933.

It is an arithmetic number, because the mean of its divisors is an integer number (33243160).

Almost surely, 2^642516450 is an apocalyptic number.

642516450 is an abundant number, since it is smaller than the sum of its proper divisors (953155230).

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

642516450 is a wasteful number, since it uses less digits than its factorization.

642516450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6011 (or 6006 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 642516450 is about 25347.9081977192. The cubic root of 642516450 is about 862.9018837058.

The spelling of 642516450 in words is "six hundred forty-two million, five hundred sixteen thousand, four hundred fifty".