78366580 has 24 divisors (see below), whose sum is σ = 168585480. Its totient is φ = 30581760.

The previous prime is 78366577. The next prime is 78366593. The reversal of 78366580 is 8566387.

It can be written as a sum of positive squares in 4 ways, for example, as 7907344 + 70459236 = 2812^2 + 8394^2 .

It is a super-2 number, since 2×78366580² = 12282641721792800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46965 + ... + 48604.

It is an arithmetic number, because the mean of its divisors is an integer number (7024395).

Almost surely, 2^78366580 is an apocalyptic number.

It is an amenable number.

78366580 is an abundant number, since it is smaller than the sum of its proper divisors (90218900).

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

78366580 is a wasteful number, since it uses less digits than its factorization.

78366580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95619 (or 95617 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 78366580 is about 8852.4900451794. The cubic root of 78366580 is about 427.9341689882.

The spelling of 78366580 in words is "seventy-eight million, three hundred sixty-six thousand, five hundred eighty".