642508471 has 8 divisors (see below), whose sum is σ = 715832064. Its totient is φ = 571670520.

The previous prime is 642508463. The next prime is 642508483. The reversal of 642508471 is 174805246.

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 642508471 - 2³ = 642508463 is a prime.

It is a super-3 number, since 3×642508471³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 642508471.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642508411) 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, 620865 + ... + 621898.

It is an arithmetic number, because the mean of its divisors is an integer number (89479008).

Almost surely, 2^642508471 is an apocalyptic number.

642508471 is a deficient number, since it is larger than the sum of its proper divisors (73323593).

642508471 is a wasteful number, since it uses less digits than its factorization.

642508471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1242821.

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 642508471 is about 25347.7508075174. The cubic root of 642508471 is about 862.8983117492.

The spelling of 642508471 in words is "six hundred forty-two million, five hundred eight thousand, four hundred seventy-one".