78819822 has 24 divisors (see below), whose sum is σ = 170959464. Its totient is φ = 26245104.

The previous prime is 78819821. The next prime is 78819833. The reversal of 78819822 is 22891887.

It is a happy number.

It is a super-2 number, since 2×78819822² = 12425128680223368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78819821) 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, 21388 + ... + 24800.

It is an arithmetic number, because the mean of its divisors is an integer number (7123311).

Almost surely, 2^78819822 is an apocalyptic number.

78819822 is an abundant number, since it is smaller than the sum of its proper divisors (92139642).

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

78819822 is a wasteful number, since it uses less digits than its factorization.

78819822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4704 (or 4701 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 78819822 is about 8878.0528270562. The cubic root of 78819822 is about 428.7575855090.

The spelling of 78819822 in words is "seventy-eight million, eight hundred nineteen thousand, eight hundred twenty-two".