78842444 has 6 divisors (see below), whose sum is σ = 137974284. Its totient is φ = 39421220.

The previous prime is 78842443. The next prime is 78842479. The reversal of 78842444 is 44424887.

It is a super-2 number, since 2×78842444² = 12432261951786272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78842441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9855302 + ... + 9855309.

It is an arithmetic number, because the mean of its divisors is an integer number (22995714).

Almost surely, 2^78842444 is an apocalyptic number.

It is an amenable number.

78842444 is a deficient number, since it is larger than the sum of its proper divisors (59131840).

78842444 is a wasteful number, since it uses less digits than its factorization.

78842444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19710615 (or 19710613 counting only the distinct ones).

The product of its digits is 229376, while the sum is 41.

The square root of 78842444 is about 8879.3267762821. The cubic root of 78842444 is about 428.7986006837.

The spelling of 78842444 in words is "seventy-eight million, eight hundred forty-two thousand, four hundred forty-four".