671611500 has 480 divisors, whose sum is σ = 2638411776. Its totient is φ = 145411200.

The previous prime is 671611489. The next prime is 671611511. The reversal of 671611500 is 5116176.

671611500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (671611489) and next prime (671611511).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 6520449 + ... + 6520551.

Almost surely, 2^671611500 is an apocalyptic number.

671611500 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671611500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1319205888).

671611500 is an abundant number, since it is smaller than the sum of its proper divisors (1966800276).

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

671611500 is a wasteful number, since it uses less digits than its factorization.

671611500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164 (or 143 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 671611500 is about 25915.4683538616. The cubic root of 671611500 is about 875.7350014723.

Adding to 671611500 its reverse (5116176), we get a palindrome (676727676).

It can be divided in two parts, 671 and 611500, that added together give a triangular number (612171 = T₁₁₀₆).

The spelling of 671611500 in words is "six hundred seventy-one million, six hundred eleven thousand, five hundred".