642470005 has 8 divisors (see below), whose sum is σ = 772068024. Its totient is φ = 513240000.

The previous prime is 642469991. The next prime is 642470011. The reversal of 642470005 is 500074246.

It can be written as a sum of positive squares in 4 ways, for example, as 180821809 + 461648196 = 13447^2 + 21486^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-642470005 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88146 + ... + 95155.

It is an arithmetic number, because the mean of its divisors is an integer number (96508503).

Almost surely, 2^642470005 is an apocalyptic number.

It is an amenable number.

642470005 is a deficient number, since it is larger than the sum of its proper divisors (129598019).

642470005 is a wasteful number, since it uses less digits than its factorization.

642470005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184007.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 642470005 is about 25346.9920306138. The cubic root of 642470005 is about 862.8810912713.

The spelling of 642470005 in words is "six hundred forty-two million, four hundred seventy thousand, five".