671200728 has 64 divisors (see below), whose sum is σ = 1847733120. Its totient is φ = 201484800.

The previous prime is 671200727. The next prime is 671200741. The reversal of 671200728 is 827002176.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671200727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16368 + ... + 40128.

It is an arithmetic number, because the mean of its divisors is an integer number (28870830).

Almost surely, 2^671200728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671200728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (923866560).

671200728 is an abundant number, since it is smaller than the sum of its proper divisors (1176532392).

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

671200728 is a wasteful number, since it uses less digits than its factorization.

671200728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23888 (or 23884 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 671200728 is about 25907.5419135046. The cubic root of 671200728 is about 875.5564256230.

The spelling of 671200728 in words is "six hundred seventy-one million, two hundred thousand, seven hundred twenty-eight".