77220222 has 24 divisors (see below), whose sum is σ = 164063256. Its totient is φ = 24225408.

The previous prime is 77220173. The next prime is 77220251. The reversal of 77220222 is 22202277.

It is a junction number, because it is equal to n+sod(n) for n = 77220192 and 77220201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20533 + ... + 24000.

It is an arithmetic number, because the mean of its divisors is an integer number (6835969).

Almost surely, 2^77220222 is an apocalyptic number.

77220222 is an abundant number, since it is smaller than the sum of its proper divisors (86843034).

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

77220222 is a wasteful number, since it uses less digits than its factorization.

77220222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44572 (or 44555 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 24.

The square root of 77220222 is about 8787.5037411087. The cubic root of 77220222 is about 425.8372827386.

Adding to 77220222 its reverse (22202277), we get a palindrome (99422499).

The spelling of 77220222 in words is "seventy-seven million, two hundred twenty thousand, two hundred twenty-two".