78312580 has 12 divisors (see below), whose sum is σ = 164456460. Its totient is φ = 31325024.

The previous prime is 78312571. The next prime is 78312587. The reversal of 78312580 is 8521387.

It can be written as a sum of positive squares in 2 ways, for example, as 40144896 + 38167684 = 6336^2 + 6178^2 .

It is a super-2 number, since 2×78312580² = 12265720372512800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78312587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1957795 + ... + 1957834.

It is an arithmetic number, because the mean of its divisors is an integer number (13704705).

Almost surely, 2^78312580 is an apocalyptic number.

It is an amenable number.

78312580 is an abundant number, since it is smaller than the sum of its proper divisors (86143880).

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

78312580 is a wasteful number, since it uses less digits than its factorization.

78312580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3915638 (or 3915636 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 78312580 is about 8849.4395302753. The cubic root of 78312580 is about 427.8358543115.

The spelling of 78312580 in words is "seventy-eight million, three hundred twelve thousand, five hundred eighty".