642127247 has 8 divisors (see below), whose sum is σ = 688507200. Its totient is φ = 596703744.

The previous prime is 642127243. The next prime is 642127279. The reversal of 642127247 is 742721246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 642127247 - 2² = 642127243 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642127243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237722 + ... + 240407.

It is an arithmetic number, because the mean of its divisors is an integer number (86063400).

Almost surely, 2^642127247 is an apocalyptic number.

642127247 is a deficient number, since it is larger than the sum of its proper divisors (46379953).

642127247 is a wasteful number, since it uses less digits than its factorization.

642127247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478225.

The product of its digits is 37632, while the sum is 35.

The square root of 642127247 is about 25340.2298134804. The cubic root of 642127247 is about 862.7276148411.

The spelling of 642127247 in words is "six hundred forty-two million, one hundred twenty-seven thousand, two hundred forty-seven".