78783456 has 48 divisors (see below), whose sum is σ = 208731600. Its totient is φ = 26016768.

The previous prime is 78783437. The next prime is 78783473. The reversal of 78783456 is 65438787.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

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, 6700 + ... + 14228.

It is an arithmetic number, because the mean of its divisors is an integer number (4348575).

Almost surely, 2^78783456 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 78783456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104365800).

78783456 is an abundant number, since it is smaller than the sum of its proper divisors (129948144).

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

78783456 is a wasteful number, since it uses less digits than its factorization.

78783456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7651 (or 7643 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 48.

The square root of 78783456 is about 8876.0045065333. The cubic root of 78783456 is about 428.6916351065.

The spelling of 78783456 in words is "seventy-eight million, seven hundred eighty-three thousand, four hundred fifty-six".