1640712772 has 12 divisors (see below), whose sum is σ = 3040144380. Its totient is φ = 772100096.

The previous prime is 1640712767. The next prime is 1640712779. The reversal of 1640712772 is 2772170461.

It can be written as a sum of positive squares in 2 ways, for example, as 558565956 + 1082146816 = 23634^2 + 32896^2 .

It is not an unprimeable number, because it can be changed into a prime (1640712779) 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 3 ways as a sum of consecutive naturals, for example, 12063997 + ... + 12064132.

It is an arithmetic number, because the mean of its divisors is an integer number (253345365).

Almost surely, 2^1640712772 is an apocalyptic number.

It is an amenable number.

1640712772 is a deficient number, since it is larger than the sum of its proper divisors (1399431608).

1640712772 is a wasteful number, since it uses less digits than its factorization.

1640712772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24128150 (or 24128148 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 37.

The square root of 1640712772 is about 40505.7128316488. The cubic root of 1640712772 is about 1179.4445274119. Note that the first 3 decimals are identical.

The spelling of 1640712772 in words is "one billion, six hundred forty million, seven hundred twelve thousand, seven hundred seventy-two".