840732644 has 6 divisors (see below), whose sum is σ = 1471282134. Its totient is φ = 420366320.

The previous prime is 840732631. The next prime is 840732677. The reversal of 840732644 is 446237048.

840732644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 524959744 + 315772900 = 22912^2 + 17770^2 .

It is a junction number, because it is equal to n+sod(n) for n = 840732598 and 840732607.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105091577 + ... + 105091584.

It is an arithmetic number, because the mean of its divisors is an integer number (245213689).

Almost surely, 2^840732644 is an apocalyptic number.

It is an amenable number.

840732644 is a deficient number, since it is larger than the sum of its proper divisors (630549490).

840732644 is a wasteful number, since it uses less digits than its factorization.

840732644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210183165 (or 210183163 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 38.

The square root of 840732644 is about 28995.3900473851. The cubic root of 840732644 is about 943.8130330310.

The spelling of 840732644 in words is "eight hundred forty million, seven hundred thirty-two thousand, six hundred forty-four".