671801402 has 4 divisors (see below), whose sum is σ = 1007702106. Its totient is φ = 335900700.

The previous prime is 671801381. The next prime is 671801413. The reversal of 671801402 is 204108176.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 667757281 + 4044121 = 25841^2 + 2011^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167950349 + ... + 167950352.

Almost surely, 2^671801402 is an apocalyptic number.

671801402 is a deficient number, since it is larger than the sum of its proper divisors (335900704).

671801402 is a wasteful number, since it uses less digits than its factorization.

671801402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335900703.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 671801402 is about 25919.1319684900. The cubic root of 671801402 is about 875.8175333905.

Adding to 671801402 its reverse (204108176), we get a palindrome (875909578).

The spelling of 671801402 in words is "six hundred seventy-one million, eight hundred one thousand, four hundred two".