77222222 has 48 divisors (see below), whose sum is σ = 148203648. Its totient is φ = 29316720.

The previous prime is 77222207. The next prime is 77222231. The reversal of 77222222 is 22222277.

It is a nude number because it is divisible by every one of its digits.

77222222 is a modest number, since divided by 22222 gives 772 as remainder.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 77222191 and 77222200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 340073 + ... + 340299.

It is an arithmetic number, because the mean of its divisors is an integer number (3087576).

Almost surely, 2^77222222 is an apocalyptic number.

77222222 is a deficient number, since it is larger than the sum of its proper divisors (70981426).

77222222 is a wasteful number, since it uses less digits than its factorization.

77222222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341 (or 294 counting only the distinct ones).

The product of its digits is 3136, while the sum is 26.

The square root of 77222222 is about 8787.6175383320. The cubic root of 77222222 is about 425.8409590952.

Adding to 77222222 its reverse (22222277), we get a palindrome (99444499).

Subtracting from 77222222 its reverse (22222277), we obtain a palindrome (54999945).

The spelling of 77222222 in words is "seventy-seven million, two hundred twenty-two thousand, two hundred twenty-two".