613666428 has 12 divisors (see below), whose sum is σ = 1431888360. Its totient is φ = 204555472.

The previous prime is 613666379. The next prime is 613666439. The reversal of 613666428 is 824666316.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 613666428.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25569423 + ... + 25569446.

It is an arithmetic number, because the mean of its divisors is an integer number (119324030).

Almost surely, 2^613666428 is an apocalyptic number.

It is an amenable number.

613666428 is an abundant number, since it is smaller than the sum of its proper divisors (818221932).

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

613666428 is a wasteful number, since it uses less digits than its factorization.

613666428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51138876 (or 51138874 counting only the distinct ones).

The product of its digits is 248832, while the sum is 42.

The square root of 613666428 is about 24772.2915371186. The cubic root of 613666428 is about 849.7883800751.

The spelling of 613666428 in words is "six hundred thirteen million, six hundred sixty-six thousand, four hundred twenty-eight".