78561444 has 24 divisors (see below), whose sum is σ = 197411200. Its totient is φ = 24172704.

The previous prime is 78561407. The next prime is 78561449. The reversal of 78561444 is 44416587.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (78561449) 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 in 7 ways as a sum of consecutive naturals, for example, 251644 + ... + 251955.

Almost surely, 2^78561444 is an apocalyptic number.

It is an amenable number.

78561444 is an abundant number, since it is smaller than the sum of its proper divisors (118849756).

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

78561444 is a wasteful number, since it uses less digits than its factorization.

78561444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503619 (or 503617 counting only the distinct ones).

The product of its digits is 107520, while the sum is 39.

The square root of 78561444 is about 8863.4893805995. The cubic root of 78561444 is about 428.2885715142.

The spelling of 78561444 in words is "seventy-eight million, five hundred sixty-one thousand, four hundred forty-four".