75779958787 has 30 divisors (see below), whose sum is σ = 83740826388. Its totient is φ = 68560425648.

The previous prime is 75779958781. The next prime is 75779958797. The reversal of 75779958787 is 78785997757.

It is a de Polignac number, because none of the positive numbers 2^k-75779958787 is a prime.

It is a super-2 number, since 2×75779958787² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75779958781) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 380803714 + ... + 380803912.

Almost surely, 2^75779958787 is an apocalyptic number.

75779958787 is a deficient number, since it is larger than the sum of its proper divisors (7960867601).

75779958787 is an frugal number, since it uses more digits than its factorization.

75779958787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517 (or 279 counting only the distinct ones).

The product of its digits is 2178187200, while the sum is 79.

The spelling of 75779958787 in words is "seventy-five billion, seven hundred seventy-nine million, nine hundred fifty-eight thousand, seven hundred eighty-seven".