642995199 has 192 divisors, whose sum is σ = 1347425280. Its totient is φ = 298045440.

The previous prime is 642995191. The next prime is 642995209. The reversal of 642995199 is 991599246.

It is not a de Polignac number, because 642995199 - 2³ = 642995191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642995191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 5690167 + ... + 5690279.

It is an arithmetic number, because the mean of its divisors is an integer number (7017840).

Almost surely, 2^642995199 is an apocalyptic number.

642995199 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

642995199 is an abundant number, since it is smaller than the sum of its proper divisors (704430081).

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

642995199 is a wasteful number, since it uses less digits than its factorization.

642995199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187 (or 174 counting only the distinct ones).

The product of its digits is 1574640, while the sum is 54.

The square root of 642995199 is about 25357.3499995563. The cubic root of 642995199 is about 863.1161510348.

The spelling of 642995199 in words is "six hundred forty-two million, nine hundred ninety-five thousand, one hundred ninety-nine".