611681540 has 12 divisors (see below), whose sum is σ = 1284531276. Its totient is φ = 244672608.

The previous prime is 611681519. The next prime is 611681557. The reversal of 611681540 is 45186116.

It can be written as a sum of positive squares in 2 ways, for example, as 380094016 + 231587524 = 19496^2 + 15218^2 .

It is a junction number, because it is equal to n+sod(n) for n = 611681497 and 611681506.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15292019 + ... + 15292058.

It is an arithmetic number, because the mean of its divisors is an integer number (107044273).

Almost surely, 2^611681540 is an apocalyptic number.

It is an amenable number.

611681540 is an abundant number, since it is smaller than the sum of its proper divisors (672849736).

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

611681540 is a wasteful number, since it uses less digits than its factorization.

611681540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30584086 (or 30584084 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 611681540 is about 24732.1964249033. The cubic root of 611681540 is about 848.8711843900.

The spelling of 611681540 in words is "six hundred eleven million, six hundred eighty-one thousand, five hundred forty".