78386444 has 12 divisors (see below), whose sum is σ = 137280864. Its totient is φ = 39163344.

The previous prime is 78386443. The next prime is 78386453. The reversal of 78386444 is 44468387.

It is a super-2 number, since 2×78386444² = 12288869205930272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78386395 and 78386404.

It is not an unprimeable number, because it can be changed into a prime (78386443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 932 + ... + 12555.

It is an arithmetic number, because the mean of its divisors is an integer number (11440072).

Almost surely, 2^78386444 is an apocalyptic number.

It is an amenable number.

78386444 is a deficient number, since it is larger than the sum of its proper divisors (58894420).

78386444 is a wasteful number, since it uses less digits than its factorization.

78386444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14944 (or 14942 counting only the distinct ones).

The product of its digits is 516096, while the sum is 44.

The square root of 78386444 is about 8853.6119183077. The cubic root of 78386444 is about 427.9703228615.

The spelling of 78386444 in words is "seventy-eight million, three hundred eighty-six thousand, four hundred forty-four".