77780223 has 16 divisors (see below), whose sum is σ = 115513440. Its totient is φ = 51725952.

The previous prime is 77780221. The next prime is 77780257. The reversal of 77780223 is 32208777.

It is not a de Polignac number, because 77780223 - 2¹ = 77780221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77780221) 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, 8365 + ... + 15017.

It is an arithmetic number, because the mean of its divisors is an integer number (7219590).

Almost surely, 2^77780223 is an apocalyptic number.

77780223 is a deficient number, since it is larger than the sum of its proper divisors (37733217).

77780223 is a wasteful number, since it uses less digits than its factorization.

77780223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7095 (or 7089 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 36.

The square root of 77780223 is about 8819.3096668617. The cubic root of 77780223 is about 426.8641949022.

The spelling of 77780223 in words is "seventy-seven million, seven hundred eighty thousand, two hundred twenty-three".