613228644 has 120 divisors (see below), whose sum is σ = 1847408640. Its totient is φ = 173746944.

The previous prime is 613228621. The next prime is 613228673. The reversal of 613228644 is 446822316.

613228644 is a `hidden beast` number, since 6 + 1 + 3 + 2 + 2 + 8 + 644 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 613228599 and 613228608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 286972 + ... + 289100.

It is an arithmetic number, because the mean of its divisors is an integer number (15395072).

Almost surely, 2^613228644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 613228644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (923704320).

613228644 is an abundant number, since it is smaller than the sum of its proper divisors (1234179996).

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

613228644 is a wasteful number, since it uses less digits than its factorization.

613228644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2279 (or 2268 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 613228644 is about 24763.4537978853. The cubic root of 613228644 is about 849.5862549246.

The spelling of 613228644 in words is "six hundred thirteen million, two hundred twenty-eight thousand, six hundred forty-four".