671687425 has 12 divisors (see below), whose sum is σ = 881886636. Its totient is φ = 505740800.

The previous prime is 671687407. The next prime is 671687453. The reversal of 671687425 is 524786176.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 3568321 + 668119104 = 1889^2 + 25848^2 .

It is not a de Polignac number, because 671687425 - 2⁹ = 671686913 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 789796 + ... + 790645.

It is an arithmetic number, because the mean of its divisors is an integer number (73490553).

Almost surely, 2^671687425 is an apocalyptic number.

It is an amenable number.

671687425 is a deficient number, since it is larger than the sum of its proper divisors (210199211).

671687425 is a wasteful number, since it uses less digits than its factorization.

671687425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580468 (or 1580463 counting only the distinct ones).

The product of its digits is 564480, while the sum is 46.

The square root of 671687425 is about 25916.9331711914. The cubic root of 671687425 is about 875.7680005472.

The spelling of 671687425 in words is "six hundred seventy-one million, six hundred eighty-seven thousand, four hundred twenty-five".