642635130 has 32 divisors (see below), whose sum is σ = 1546646400. Its totient is φ = 170889152.

The previous prime is 642635117. The next prime is 642635141. The reversal of 642635130 is 31536246.

It is a Harshad number since it is a multiple of its sum of digits (30).

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 15 ways as a sum of consecutive naturals, for example, 19065 + ... + 40604.

It is an arithmetic number, because the mean of its divisors is an integer number (48332700).

Almost surely, 2^642635130 is an apocalyptic number.

642635130 is an abundant number, since it is smaller than the sum of its proper divisors (904011270).

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

642635130 is a wasteful number, since it uses less digits than its factorization.

642635130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60038.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 642635130 is about 25350.2491112020. The cubic root of 642635130 is about 862.9550096561.

The spelling of 642635130 in words is "six hundred forty-two million, six hundred thirty-five thousand, one hundred thirty".