78236928 has 360 divisors, whose sum is σ = 296788800. Its totient is φ = 20321280.

The previous prime is 78236881. The next prime is 78236929. The reversal of 78236928 is 82963287.

It is a super-2 number, since 2×78236928² = 12242033805754368, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78236929) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 7112443 + ... + 7112453.

Almost surely, 2^78236928 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 78236928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148394400).

78236928 is an abundant number, since it is smaller than the sum of its proper divisors (218551872).

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

78236928 is an equidigital number, since it uses as much as digits as its factorization.

78236928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60 (or 23 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 78236928 is about 8845.1641024913. The cubic root of 78236928 is about 427.6980430514.

The spelling of 78236928 in words is "seventy-eight million, two hundred thirty-six thousand, nine hundred twenty-eight".