77220022 has 24 divisors (see below), whose sum is σ = 129429216. Its totient is φ = 34518000.

The previous prime is 77219969. The next prime is 77220029. The reversal of 77220022 is 22002277.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 77219975 and 77220002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77220029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12147 + ... + 17377.

It is an arithmetic number, because the mean of its divisors is an integer number (5392884).

Almost surely, 2^77220022 is an apocalyptic number.

77220022 is a deficient number, since it is larger than the sum of its proper divisors (52209194).

77220022 is a wasteful number, since it uses less digits than its factorization.

77220022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5316 (or 5305 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 22.

The square root of 77220022 is about 8787.4923613054. The cubic root of 77220022 is about 425.8369150995.

Adding to 77220022 its reverse (22002277), we get a palindrome (99222299).

The spelling of 77220022 in words is "seventy-seven million, two hundred twenty thousand, twenty-two".