772216818 has 16 divisors (see below), whose sum is σ = 1544761920. Its totient is φ = 257350896.

The previous prime is 772216817. The next prime is 772216847. The reversal of 772216818 is 818612277.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 772216818.

It is not an unprimeable number, because it can be changed into a prime (772216817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25563 + ... + 46881.

It is an arithmetic number, because the mean of its divisors is an integer number (96547620).

Almost surely, 2^772216818 is an apocalyptic number.

772216818 is an abundant number, since it is smaller than the sum of its proper divisors (772545102).

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

772216818 is a wasteful number, since it uses less digits than its factorization.

772216818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27361.

The product of its digits is 75264, while the sum is 42.

The square root of 772216818 is about 27788.7894302721. The cubic root of 772216818 is about 917.4443954056. Note that the first 3 decimals are identical.

The spelling of 772216818 in words is "seven hundred seventy-two million, two hundred sixteen thousand, eight hundred eighteen".