613679820 has 72 divisors (see below), whose sum is σ = 1852569264. Its totient is φ = 150889344.

The previous prime is 613679819. The next prime is 613679837. The reversal of 613679820 is 28976316.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 691417 + ... + 692303.

Almost surely, 2^613679820 is an apocalyptic number.

613679820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 613679820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (926284632).

613679820 is an abundant number, since it is smaller than the sum of its proper divisors (1238889444).

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

613679820 is a wasteful number, since it uses less digits than its factorization.

613679820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1799 (or 910 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 613679820 is about 24772.5618376461. The cubic root of 613679820 is about 849.7945616545.

The spelling of 613679820 in words is "six hundred thirteen million, six hundred seventy-nine thousand, eight hundred twenty".