78226780 has 12 divisors (see below), whose sum is σ = 164276280. Its totient is φ = 31290704.

The previous prime is 78226777. The next prime is 78226787. The reversal of 78226780 is 8762287.

It is a super-2 number, since 2×78226780² = 12238858218336800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78226787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1955650 + ... + 1955689.

It is an arithmetic number, because the mean of its divisors is an integer number (13689690).

Almost surely, 2^78226780 is an apocalyptic number.

It is an amenable number.

78226780 is an abundant number, since it is smaller than the sum of its proper divisors (86049500).

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

78226780 is a wasteful number, since it uses less digits than its factorization.

78226780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3911348 (or 3911346 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 78226780 is about 8844.5904370977. The cubic root of 78226780 is about 427.6795502181.

The spelling of 78226780 in words is "seventy-eight million, two hundred twenty-six thousand, seven hundred eighty".