671079825 has 72 divisors (see below), whose sum is σ = 1300345592. Its totient is φ = 328872960.

The previous prime is 671079823. The next prime is 671079863. The reversal of 671079825 is 528970176.

It can be written as a sum of positive squares in 12 ways, for example, as 321090561 + 349989264 = 17919^2 + 18708^2 .

It is not a de Polignac number, because 671079825 - 2¹ = 671079823 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671079821) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 915159 + ... + 915891.

Almost surely, 2^671079825 is an apocalyptic number.

671079825 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

671079825 is a deficient number, since it is larger than the sum of its proper divisors (629265767).

671079825 is a wasteful number, since it uses less digits than its factorization.

671079825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1075 (or 1067 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The square root of 671079825 is about 25905.2084531277. The cubic root of 671079825 is about 875.5038513082.

The spelling of 671079825 in words is "six hundred seventy-one million, seventy-nine thousand, eight hundred twenty-five".