78330280 has 32 divisors (see below), whose sum is σ = 201421440. Its totient is φ = 26856000.

The previous prime is 78330277. The next prime is 78330281. The reversal of 78330280 is 8203387.

It is a super-2 number, since 2×78330280² = 12271265529756800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78330281) 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 7 ways as a sum of consecutive naturals, for example, 139596 + ... + 140155.

It is an arithmetic number, because the mean of its divisors is an integer number (6294420).

Almost surely, 2^78330280 is an apocalyptic number.

78330280 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

78330280 is an abundant number, since it is smaller than the sum of its proper divisors (123091160).

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

78330280 is a wasteful number, since it uses less digits than its factorization.

78330280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279769 (or 279765 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 78330280 is about 8850.4395371077. The cubic root of 78330280 is about 427.8680846554.

The spelling of 78330280 in words is "seventy-eight million, three hundred thirty thousand, two hundred eighty".