78474432 has 56 divisors (see below), whose sum is σ = 209525616. Its totient is φ = 25919488.

The previous prime is 78474401. The next prime is 78474439. The reversal of 78474432 is 23447487.

It is not an unprimeable number, because it can be changed into a prime (78474439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19888 + ... + 23504.

Almost surely, 2^78474432 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 78474432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104762808).

78474432 is an abundant number, since it is smaller than the sum of its proper divisors (131051184).

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

78474432 is a wasteful number, since it uses less digits than its factorization.

78474432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3745 (or 3735 counting only the distinct ones).

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

The square root of 78474432 is about 8858.5795701117. The cubic root of 78474432 is about 428.1303937872.

The spelling of 78474432 in words is "seventy-eight million, four hundred seventy-four thousand, four hundred thirty-two".