78280812 has 72 divisors (see below), whose sum is σ = 206045840. Its totient is φ = 25038720.

The previous prime is 78280793. The next prime is 78280819. The reversal of 78280812 is 21808287.

It is a super-2 number, since 2×78280812² = 12255771054758688, which contains 22 as substring.

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 (78280819) 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 23 ways as a sum of consecutive naturals, for example, 94014 + ... + 94842.

Almost surely, 2^78280812 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 78280812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103022920).

78280812 is an abundant number, since it is smaller than the sum of its proper divisors (127765028).

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

78280812 is a wasteful number, since it uses less digits than its factorization.

78280812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 943 (or 938 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 78280812 is about 8847.6444322769. The cubic root of 78280812 is about 427.7779950350. Note that the first 3 decimals are identical.

The spelling of 78280812 in words is "seventy-eight million, two hundred eighty thousand, eight hundred twelve".