613881820 has 24 divisors (see below), whose sum is σ = 1306814544. Its totient is φ = 242188416.

The previous prime is 613881817. The next prime is 613881847. The reversal of 613881820 is 28188316.

It is a self number, because there is not a number n which added to its sum of digits gives 613881820.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208774 + ... + 211693.

It is an arithmetic number, because the mean of its divisors is an integer number (54450606).

Almost surely, 2^613881820 is an apocalyptic number.

It is an amenable number.

613881820 is an abundant number, since it is smaller than the sum of its proper divisors (692932724).

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

613881820 is a wasteful number, since it uses less digits than its factorization.

613881820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420549 (or 420547 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 613881820 is about 24776.6385936430. The cubic root of 613881820 is about 849.8877914164.

The spelling of 613881820 in words is "six hundred thirteen million, eight hundred eighty-one thousand, eight hundred twenty".