671825639 has 8 divisors (see below), whose sum is σ = 679470960. Its totient is φ = 664200000.

The previous prime is 671825597. The next prime is 671825663. The reversal of 671825639 is 936528176.

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 671825639 - 2⁸ = 671825383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 671825593 and 671825602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671825039) 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, 70139 + ... + 79139.

It is an arithmetic number, because the mean of its divisors is an integer number (84933870).

Almost surely, 2^671825639 is an apocalyptic number.

671825639 is a deficient number, since it is larger than the sum of its proper divisors (7645321).

671825639 is a wasteful number, since it uses less digits than its factorization.

671825639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9841.

The product of its digits is 544320, while the sum is 47.

The square root of 671825639 is about 25919.5995146530. The cubic root of 671825639 is about 875.8280657365.

The spelling of 671825639 in words is "six hundred seventy-one million, eight hundred twenty-five thousand, six hundred thirty-nine".