78436580 has 24 divisors (see below), whose sum is σ = 165828600. Its totient is φ = 31162880.

The previous prime is 78436573. The next prime is 78436591. The reversal of 78436580 is 8563487.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10407076 + 68029504 = 3226^2 + 8248^2 .

It is an unprimeable number.

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, 10181 + ... + 16140.

It is an arithmetic number, because the mean of its divisors is an integer number (6909525).

Almost surely, 2^78436580 is an apocalyptic number.

It is an amenable number.

78436580 is an abundant number, since it is smaller than the sum of its proper divisors (87392020).

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

78436580 is a wasteful number, since it uses less digits than its factorization.

78436580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26479 (or 26477 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 41.

The square root of 78436580 is about 8856.4428525227. The cubic root of 78436580 is about 428.0615467435.

The spelling of 78436580 in words is "seventy-eight million, four hundred thirty-six thousand, five hundred eighty".