78261444 has 24 divisors (see below), whose sum is σ = 202900320. Its totient is φ = 26087112.

The previous prime is 78261431. The next prime is 78261451. The reversal of 78261444 is 44416287.

It is a super-2 number, since 2×78261444² = 12249707233930272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 78261399 and 78261408.

It is an unprimeable number.

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, 362214 + ... + 362429.

It is an arithmetic number, because the mean of its divisors is an integer number (8454180).

Almost surely, 2^78261444 is an apocalyptic number.

It is an amenable number.

78261444 is an abundant number, since it is smaller than the sum of its proper divisors (124638876).

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

78261444 is a wasteful number, since it uses less digits than its factorization.

78261444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724656 (or 724648 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The square root of 78261444 is about 8846.5498359530. The cubic root of 78261444 is about 427.7427122822.

It can be divided in two parts, 782 and 61444, that added together give a palindrome (62226).

The spelling of 78261444 in words is "seventy-eight million, two hundred sixty-one thousand, four hundred forty-four".