78544442 has 16 divisors (see below), whose sum is σ = 124770240. Its totient is φ = 36979488.

The previous prime is 78544409. The next prime is 78544447. The reversal of 78544442 is 24444587.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 78544396 and 78544405.

It is not an unprimeable number, because it can be changed into a prime (78544447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158 + ... + 12534.

It is an arithmetic number, because the mean of its divisors is an integer number (7798140).

Almost surely, 2^78544442 is an apocalyptic number.

78544442 is a deficient number, since it is larger than the sum of its proper divisors (46225798).

78544442 is a wasteful number, since it uses less digits than its factorization.

78544442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12565.

The product of its digits is 143360, while the sum is 38.

The square root of 78544442 is about 8862.5302256184. The cubic root of 78544442 is about 428.2576730340.

The spelling of 78544442 in words is "seventy-eight million, five hundred forty-four thousand, four hundred forty-two".