611536644 has 18 divisors (see below), whose sum is σ = 1545828830. Its totient is φ = 203845536.

The previous prime is 611536643. The next prime is 611536663. The reversal of 611536644 is 446635116.

It is a happy number.

611536644 is a `hidden beast` number, since 6 + 1 + 1 + 5 + 3 + 6 + 644 = 666.

It can be written as a sum of positive squares in only one way, i.e., 358344900 + 253191744 = 18930^2 + 15912^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 16987129 = 611536644 / (6 + 1 + 1 + 5 + 3 + 6 + 6 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 611536599 and 611536608.

It is not an unprimeable number, because it can be changed into a prime (611536643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8493529 + ... + 8493600.

Almost surely, 2^611536644 is an apocalyptic number.

It is an amenable number.

611536644 is an abundant number, since it is smaller than the sum of its proper divisors (934292186).

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

611536644 is a wasteful number, since it uses less digits than its factorization.

611536644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16987139 (or 16987134 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 611536644 is about 24729.2669523381. The cubic root of 611536644 is about 848.8041518225.

The spelling of 611536644 in words is "six hundred eleven million, five hundred thirty-six thousand, six hundred forty-four".