78313805 has 8 divisors (see below), whose sum is σ = 94184952. Its totient is φ = 62512128.

The previous prime is 78313789. The next prime is 78313817. The reversal of 78313805 is 50831387.

It can be written as a sum of positive squares in 4 ways, for example, as 37724164 + 40589641 = 6142^2 + 6371^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78313805 - 2⁴ = 78313789 is a prime.

It is a super-2 number, since 2×78313805² = 12266104107156050, which contains 22 as substring.

It is a Duffinian number.

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, 14852 + ... + 19421.

It is an arithmetic number, because the mean of its divisors is an integer number (11773119).

Almost surely, 2^78313805 is an apocalyptic number.

It is an amenable number.

78313805 is a deficient number, since it is larger than the sum of its proper divisors (15871147).

78313805 is a wasteful number, since it uses less digits than its factorization.

78313805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34735.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 78313805 is about 8849.5087434275. The cubic root of 78313805 is about 427.8380850990.

The spelling of 78313805 in words is "seventy-eight million, three hundred thirteen thousand, eight hundred five".