1290640544 has 24 divisors (see below), whose sum is σ = 2690417268. Its totient is φ = 607360000.

The previous prime is 1290640537. The next prime is 1290640553. The reversal of 1290640544 is 4450460921.

It can be written as a sum of positive squares in 2 ways, for example, as 1280780944 + 9859600 = 35788^2 + 3140^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1185707 + ... + 1186794.

Almost surely, 2^1290640544 is an apocalyptic number.

It is an amenable number.

1290640544 is an abundant number, since it is smaller than the sum of its proper divisors (1399776724).

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

1290640544 is a wasteful number, since it uses less digits than its factorization.

1290640544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2372528 (or 2372520 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 1290640544 is about 35925.4859953209. The cubic root of 1290640544 is about 1088.7673814222.

The spelling of 1290640544 in words is "one billion, two hundred ninety million, six hundred forty thousand, five hundred forty-four".