1320807761 has 16 divisors (see below), whose sum is σ = 1647886464. Its totient is φ = 1030713984.

The previous prime is 1320807757. The next prime is 1320807779. The reversal of 1320807761 is 1677080231.

It is a cyclic number.

It is not a de Polignac number, because 1320807761 - 2² = 1320807757 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1320807701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92771 + ... + 106056.

It is an arithmetic number, because the mean of its divisors is an integer number (102992904).

Almost surely, 2^1320807761 is an apocalyptic number.

It is an amenable number.

1320807761 is a deficient number, since it is larger than the sum of its proper divisors (327078703).

1320807761 is a wasteful number, since it uses less digits than its factorization.

1320807761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198920.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 1320807761 is about 36342.9189939388. The cubic root of 1320807761 is about 1097.1850230833.

Adding to 1320807761 its reverse (1677080231), we get a palindrome (2997887992).

The spelling of 1320807761 in words is "one billion, three hundred twenty million, eight hundred seven thousand, seven hundred sixty-one".