642226847 has 8 divisors (see below), whose sum is σ = 690412800. Its totient is φ = 595479384.

The previous prime is 642226831. The next prime is 642226873. The reversal of 642226847 is 748622246.

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 642226847 - 2⁴ = 642226831 is a prime.

It is a super-2 number, since 2×642226847² = 824910646015122818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642226817) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 358697 + ... + 360482.

It is an arithmetic number, because the mean of its divisors is an integer number (86301600).

Almost surely, 2^642226847 is an apocalyptic number.

642226847 is a deficient number, since it is larger than the sum of its proper divisors (48185953).

642226847 is a wasteful number, since it uses less digits than its factorization.

642226847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719245.

The product of its digits is 258048, while the sum is 41.

The square root of 642226847 is about 25342.1949917524. The cubic root of 642226847 is about 862.7722182685.

The spelling of 642226847 in words is "six hundred forty-two million, two hundred twenty-six thousand, eight hundred forty-seven".