78243744 has 96 divisors (see below), whose sum is σ = 213542784. Its totient is φ = 25067520.

The previous prime is 78243743. The next prime is 78243757. The reversal of 78243744 is 44734287.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×78243744² = 12244166950275072, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78243743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 405312 + ... + 405504.

It is an arithmetic number, because the mean of its divisors is an integer number (2224404).

Almost surely, 2^78243744 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78243744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106771392).

78243744 is an abundant number, since it is smaller than the sum of its proper divisors (135299040).

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

78243744 is a wasteful number, since it uses less digits than its factorization.

78243744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350 (or 342 counting only the distinct ones).

The product of its digits is 150528, while the sum is 39.

The square root of 78243744 is about 8845.5493893822. The cubic root of 78243744 is about 427.7104630398.

It can be divided in two parts, 78243 and 744, that added together give a palindrome (78987).

The spelling of 78243744 in words is "seventy-eight million, two hundred forty-three thousand, seven hundred forty-four".