78236780 has 48 divisors (see below), whose sum is σ = 173970720. Its totient is φ = 29503488.

The previous prime is 78236779. The next prime is 78236789. The reversal of 78236780 is 8763287.

It is a super-2 number, since 2×78236780² = 12241987489536800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (78236789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23372 + ... + 26508.

It is an arithmetic number, because the mean of its divisors is an integer number (3624390).

Almost surely, 2^78236780 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 78236780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86985360).

78236780 is an abundant number, since it is smaller than the sum of its proper divisors (95733940).

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

78236780 is a wasteful number, since it uses less digits than its factorization.

78236780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3218 (or 3216 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 78236780 is about 8845.1557363339. The cubic root of 78236780 is about 427.6977733605.

The spelling of 78236780 in words is "seventy-eight million, two hundred thirty-six thousand, seven hundred eighty".