78427404 has 72 divisors (see below), whose sum is σ = 219312912. Its totient is φ = 23431680.

The previous prime is 78427403. The next prime is 78427417. The reversal of 78427404 is 40472487.

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

It is not an unprimeable number, because it can be changed into a prime (78427403) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27552 + ... + 30264.

Almost surely, 2^78427404 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 78427404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109656456).

78427404 is an abundant number, since it is smaller than the sum of its proper divisors (140885508).

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

78427404 is a wasteful number, since it uses less digits than its factorization.

78427404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2807 (or 2802 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 36.

The square root of 78427404 is about 8855.9247964287. The cubic root of 78427404 is about 428.0448536566.

The spelling of 78427404 in words is "seventy-eight million, four hundred twenty-seven thousand, four hundred four".