7780687213 has 16 divisors (see below), whose sum is σ = 8456647360. Its totient is φ = 7116004224.

The previous prime is 7780687183. The next prime is 7780687237. The reversal of 7780687213 is 3127860877.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7780687213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7780687253) 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, 940945 + ... + 949177.

It is an arithmetic number, because the mean of its divisors is an integer number (528540460).

Almost surely, 2^7780687213 is an apocalyptic number.

It is an amenable number.

7780687213 is a deficient number, since it is larger than the sum of its proper divisors (675960147).

7780687213 is a wasteful number, since it uses less digits than its factorization.

7780687213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8908.

The product of its (nonzero) digits is 790272, while the sum is 49.

The square root of 7780687213 is about 88208.2037737987. The cubic root of 7780687213 is about 1981.5543361593.

The spelling of 7780687213 in words is "seven billion, seven hundred eighty million, six hundred eighty-seven thousand, two hundred thirteen".