78236444 has 24 divisors (see below), whose sum is σ = 160850928. Its totient is φ = 32826240.

The previous prime is 78236443. The next prime is 78236447. The reversal of 78236444 is 44463287.

It is a super-2 number, since 2×78236444² = 12241882339530272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78236398 and 78236407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78236443) 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 7 ways as a sum of consecutive naturals, for example, 67817 + ... + 68960.

It is an arithmetic number, because the mean of its divisors is an integer number (6702122).

Almost surely, 2^78236444 is an apocalyptic number.

It is an amenable number.

78236444 is an abundant number, since it is smaller than the sum of its proper divisors (82614484).

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

78236444 is a wasteful number, since it uses less digits than its factorization.

78236444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136805 (or 136803 counting only the distinct ones).

The product of its digits is 129024, while the sum is 38.

The square root of 78236444 is about 8845.1367428661. The cubic root of 78236444 is about 427.6971610882.

The spelling of 78236444 in words is "seventy-eight million, two hundred thirty-six thousand, four hundred forty-four".