642673530 has 24 divisors (see below), whose sum is σ = 1670951412. Its totient is φ = 171379584.

The previous prime is 642673529. The next prime is 642673573. The reversal of 642673530 is 35376246.

642673530 is a `hidden beast` number, since 64 + 2 + 67 + 3 + 530 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 640039401 + 2634129 = 25299^2 + 1623^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3570319 + ... + 3570498.

Almost surely, 2^642673530 is an apocalyptic number.

642673530 is an abundant number, since it is smaller than the sum of its proper divisors (1028277882).

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

642673530 is a wasteful number, since it uses less digits than its factorization.

642673530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7140830 (or 7140827 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 36.

The square root of 642673530 is about 25351.0064888951. The cubic root of 642673530 is about 862.9721976428.

The spelling of 642673530 in words is "six hundred forty-two million, six hundred seventy-three thousand, five hundred thirty".