1320761646 has 32 divisors (see below), whose sum is σ = 2958151680. Its totient is φ = 436785048.

The previous prime is 1320761639. The next prime is 1320761647. The reversal of 1320761646 is 6461670231.

It is a happy number.

1320761646 is a `hidden beast` number, since 1 + 3 + 2 + 0 + 7 + 6 + 1 + 646 = 666.

It is a super-2 number, since 2×1320761646² = 3488822651089258632, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1320761646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320761647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89436 + ... + 103151.

It is an arithmetic number, because the mean of its divisors is an integer number (92442240).

Almost surely, 2^1320761646 is an apocalyptic number.

1320761646 is an abundant number, since it is smaller than the sum of its proper divisors (1637390034).

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

1320761646 is a wasteful number, since it uses less digits than its factorization.

1320761646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192725 (or 192719 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 1320761646 is about 36342.2845456914. The cubic root of 1320761646 is about 1097.1722538074.

The spelling of 1320761646 in words is "one billion, three hundred twenty million, seven hundred sixty-one thousand, six hundred forty-six".