642745471 has 8 divisors (see below), whose sum is σ = 687666800. Its totient is φ = 598933440.

The previous prime is 642745429. The next prime is 642745483. The reversal of 642745471 is 174547246.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642745471 is a prime.

It is a super-3 number, since 3×642745471³ (a number of 27 digits) contains 333 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 (642745421) 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, 276126 + ... + 278443.

It is an arithmetic number, because the mean of its divisors is an integer number (85958350).

Almost surely, 2^642745471 is an apocalyptic number.

642745471 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

642745471 is a deficient number, since it is larger than the sum of its proper divisors (44921329).

642745471 is a wasteful number, since it uses less digits than its factorization.

642745471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554649.

The product of its digits is 188160, while the sum is 40.

The square root of 642745471 is about 25352.4253474889. The cubic root of 642745471 is about 863.0043968667.

The spelling of 642745471 in words is "six hundred forty-two million, seven hundred forty-five thousand, four hundred seventy-one".