1029720644 has 6 divisors (see below), whose sum is σ = 1802011134. Its totient is φ = 514860320.

The previous prime is 1029720589. The next prime is 1029720677. The reversal of 1029720644 is 4460279201.

It can be written as a sum of positive squares in only one way, i.e., 906732544 + 122988100 = 30112^2 + 11090^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128715077 + ... + 128715084.

It is an arithmetic number, because the mean of its divisors is an integer number (300335189).

Almost surely, 2^1029720644 is an apocalyptic number.

It is an amenable number.

1029720644 is a deficient number, since it is larger than the sum of its proper divisors (772290490).

1029720644 is a wasteful number, since it uses less digits than its factorization.

1029720644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257430165 (or 257430163 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 1029720644 is about 32089.2605711007. The cubic root of 1029720644 is about 1009.8103241502.

Adding to 1029720644 its reverse (4460279201), we get a palindrome (5489999845).

The spelling of 1029720644 in words is "one billion, twenty-nine million, seven hundred twenty thousand, six hundred forty-four".