671862621 has 4 divisors (see below), whose sum is σ = 895816832. Its totient is φ = 447908412.

The previous prime is 671862619. The next prime is 671862623. The reversal of 671862621 is 126268176.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (671862619) and next prime (671862623).

It is not a de Polignac number, because 671862621 - 2¹ = 671862619 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 671862621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671862623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111977101 + ... + 111977106.

It is an arithmetic number, because the mean of its divisors is an integer number (223954208).

Almost surely, 2^671862621 is an apocalyptic number.

It is an amenable number.

671862621 is a deficient number, since it is larger than the sum of its proper divisors (223954211).

671862621 is a wasteful number, since it uses less digits than its factorization.

671862621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223954210.

The product of its digits is 48384, while the sum is 39.

The square root of 671862621 is about 25920.3129032039. The cubic root of 671862621 is about 875.8441360169.

The spelling of 671862621 in words is "six hundred seventy-one million, eight hundred sixty-two thousand, six hundred twenty-one".