78634320 has 80 divisors (see below), whose sum is σ = 246210432. Its totient is φ = 20759040.

The previous prime is 78634319. The next prime is 78634343. The reversal of 78634320 is 2343687.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23130 + ... + 26310.

Almost surely, 2^78634320 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 78634320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123105216).

78634320 is an abundant number, since it is smaller than the sum of its proper divisors (167576112).

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

78634320 is a wasteful number, since it uses less digits than its factorization.

78634320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3300 (or 3294 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 78634320 is about 8867.5994496820. The cubic root of 78634320 is about 428.4209617821.

The spelling of 78634320 in words is "seventy-eight million, six hundred thirty-four thousand, three hundred twenty".