778540213 has 8 divisors (see below), whose sum is σ = 849584736. Its totient is φ = 707540400.

The previous prime is 778540193. The next prime is 778540247. The reversal of 778540213 is 312045877.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-778540213 is a prime.

It is a super-2 number, since 2×778540213² = 1212249726516170738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778540253) 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 7 ways as a sum of consecutive naturals, for example, 32770 + ... + 51292.

It is an arithmetic number, because the mean of its divisors is an integer number (106198092).

Almost surely, 2^778540213 is an apocalyptic number.

It is an amenable number.

778540213 is a deficient number, since it is larger than the sum of its proper divisors (71044523).

778540213 is a wasteful number, since it uses less digits than its factorization.

778540213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22355.

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 778540213 is about 27902.3334687262. Note that the first 3 decimals coincide. The cubic root of 778540213 is about 919.9417941279.

The spelling of 778540213 in words is "seven hundred seventy-eight million, five hundred forty thousand, two hundred thirteen".