671429645 has 8 divisors (see below), whose sum is σ = 813108120. Its totient is φ = 532215360.

The previous prime is 671429609. The next prime is 671429677. The reversal of 671429645 is 546924176.

It can be written as a sum of positive squares in 4 ways, for example, as 216119401 + 455310244 = 14701^2 + 21338^2 .

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

It is not a de Polignac number, because 671429645 - 2¹⁰ = 671428621 is a prime.

It is a super-3 number, since 3×671429645³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 671429596 and 671429605.

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, 615446 + ... + 616535.

It is an arithmetic number, because the mean of its divisors is an integer number (101638515).

Almost surely, 2^671429645 is an apocalyptic number.

It is an amenable number.

671429645 is a deficient number, since it is larger than the sum of its proper divisors (141678475).

671429645 is a wasteful number, since it uses less digits than its factorization.

671429645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232095.

The product of its digits is 362880, while the sum is 44.

The square root of 671429645 is about 25911.9594974984. The cubic root of 671429645 is about 875.6559522178.

The spelling of 671429645 in words is "six hundred seventy-one million, four hundred twenty-nine thousand, six hundred forty-five".