671605650 has 36 divisors (see below), whose sum is σ = 1804381722. Its totient is φ = 179094720.

The previous prime is 671605643. The next prime is 671605657. The reversal of 671605650 is 56506176.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (671605643) and next prime (671605657).

It can be written as a sum of positive squares in 3 ways, for example, as 574129521 + 97476129 = 23961^2 + 9873^2 .

It is a super-2 number, since 2×671605650² = 902108298223845000, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (671605657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 745779 + ... + 746678.

Almost surely, 2^671605650 is an apocalyptic number.

671605650 is an abundant number, since it is smaller than the sum of its proper divisors (1132776072).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

671605650 is a wasteful number, since it uses less digits than its factorization.

671605650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1492475 (or 1492467 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 671605650 is about 25915.3554866608. The cubic root of 671605650 is about 875.7324587996.

The spelling of 671605650 in words is "six hundred seventy-one million, six hundred five thousand, six hundred fifty".