78280306 has 16 divisors (see below), whose sum is σ = 127877400. Its totient is φ = 35722368.

The previous prime is 78280303. The next prime is 78280313. The reversal of 78280306 is 60308287.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 50623225 + 27657081 = 7115^2 + 5259^2 .

It is a super-2 number, since 2×78280306² = 12255612614907272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78280303) 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, 14601 + ... + 19228.

Almost surely, 2^78280306 is an apocalyptic number.

78280306 is a deficient number, since it is larger than the sum of its proper divisors (49597094).

78280306 is a wasteful number, since it uses less digits than its factorization.

78280306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33933.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 78280306 is about 8847.6158370490. The cubic root of 78280306 is about 427.7770733271. Note that the first 3 decimals are identical.

The spelling of 78280306 in words is "seventy-eight million, two hundred eighty thousand, three hundred six".