1290728444 has 24 divisors (see below), whose sum is σ = 2481037440. Its totient is φ = 584814384.

The previous prime is 1290728441. The next prime is 1290728447. The reversal of 1290728444 is 4448270921.

It is an interprime number because it is at equal distance from previous prime (1290728441) and next prime (1290728447).

It is a super-2 number, since 2×1290728444² = 3331959832301322272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1290728441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 367454 + ... + 370949.

It is an arithmetic number, because the mean of its divisors is an integer number (103376560).

Almost surely, 2^1290728444 is an apocalyptic number.

It is an amenable number.

1290728444 is a deficient number, since it is larger than the sum of its proper divisors (1190308996).

1290728444 is a wasteful number, since it uses less digits than its factorization.

1290728444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738449 (or 738447 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 1290728444 is about 35926.7093399883. The cubic root of 1290728444 is about 1088.7920979555.

The spelling of 1290728444 in words is "one billion, two hundred ninety million, seven hundred twenty-eight thousand, four hundred forty-four".