611728987 has 4 divisors (see below), whose sum is σ = 632823120. Its totient is φ = 590634856.

The previous prime is 611728939. The next prime is 611728993. The reversal of 611728987 is 789827116.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 611728987 - 2¹¹ = 611726939 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 611728987.

It is not an unprimeable number, because it can be changed into a prime (611728927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10547023 + ... + 10547080.

It is an arithmetic number, because the mean of its divisors is an integer number (158205780).

Almost surely, 2^611728987 is an apocalyptic number.

611728987 is a deficient number, since it is larger than the sum of its proper divisors (21094133).

611728987 is a wasteful number, since it uses less digits than its factorization.

611728987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21094132.

The product of its digits is 338688, while the sum is 49.

The square root of 611728987 is about 24733.1556215538. The cubic root of 611728987 is about 848.8931322758.

The spelling of 611728987 in words is "six hundred eleven million, seven hundred twenty-eight thousand, nine hundred eighty-seven".