78222208 has 16 divisors (see below), whose sum is σ = 155833560. Its totient is φ = 39111040.

The previous prime is 78222197. The next prime is 78222211. The reversal of 78222208 is 80222287.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×78222208² = 12237427648790528, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78222208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305428 + ... + 305683.

Almost surely, 2^78222208 is an apocalyptic number.

It is an amenable number.

78222208 is a deficient number, since it is larger than the sum of its proper divisors (77611352).

78222208 is an equidigital number, since it uses as much as digits as its factorization.

78222208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611125 (or 611113 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 31.

The square root of 78222208 is about 8844.3319702508. The cubic root of 78222208 is about 427.6712180800.

The spelling of 78222208 in words is "seventy-eight million, two hundred twenty-two thousand, two hundred eight".