642471447 has 8 divisors (see below), whose sum is σ = 857180160. Its totient is φ = 428038520.

The previous prime is 642471439. The next prime is 642471457. The reversal of 642471447 is 744174246.

It is a happy number.

642471447 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 642471447 - 2³ = 642471439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642471437) 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, 63447 + ... + 72872.

It is an arithmetic number, because the mean of its divisors is an integer number (107147520).

Almost surely, 2^642471447 is an apocalyptic number.

642471447 is a deficient number, since it is larger than the sum of its proper divisors (214708713).

642471447 is a wasteful number, since it uses less digits than its factorization.

642471447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137893.

The product of its digits is 150528, while the sum is 39.

The square root of 642471447 is about 25347.0204757877. The cubic root of 642471447 is about 862.8817368390.

The spelling of 642471447 in words is "six hundred forty-two million, four hundred seventy-one thousand, four hundred forty-seven".