78332780 has 12 divisors (see below), whose sum is σ = 164498880. Its totient is φ = 31333104.

The previous prime is 78332759. The next prime is 78332783. The reversal of 78332780 is 8723387.

It is a super-2 number, since 2×78332780² = 12272048845056800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78332783) 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 3 ways as a sum of consecutive naturals, for example, 1958300 + ... + 1958339.

It is an arithmetic number, because the mean of its divisors is an integer number (13708240).

Almost surely, 2^78332780 is an apocalyptic number.

It is an amenable number.

78332780 is an abundant number, since it is smaller than the sum of its proper divisors (86166100).

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

78332780 is a wasteful number, since it uses less digits than its factorization.

78332780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3916648 (or 3916646 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 78332780 is about 8850.5807719042. The cubic root of 78332780 is about 427.8726365726.

The spelling of 78332780 in words is "seventy-eight million, three hundred thirty-two thousand, seven hundred eighty".