1728780516 has 48 divisors (see below), whose sum is σ = 4505300800. Its totient is φ = 573267456.

The previous prime is 1728780511. The next prime is 1728780527. The reversal of 1728780516 is 6150878271.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1728780511) 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, 20626 + ... + 62313.

Almost surely, 2^1728780516 is an apocalyptic number.

It is an amenable number.

1728780516 is an abundant number, since it is smaller than the sum of its proper divisors (2776520284).

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

1728780516 is a wasteful number, since it uses less digits than its factorization.

1728780516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83145 (or 83137 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 45.

The square root of 1728780516 is about 41578.6064701548. The cubic root of 1728780516 is about 1200.1806478039.

The spelling of 1728780516 in words is "one billion, seven hundred twenty-eight million, seven hundred eighty thousand, five hundred sixteen".