78317290 has 16 divisors (see below), whose sum is σ = 143283240. Its totient is φ = 30813120.

The previous prime is 78317287. The next prime is 78317303. The reversal of 78317290 is 9271387.

It can be written as a sum of positive squares in 4 ways, for example, as 65593801 + 12723489 = 8099^2 + 3567^2 .

It is a super-2 number, since 2×78317290² = 12267195825888200, which contains 22 as substring.

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, 63585 + ... + 64804.

Almost surely, 2^78317290 is an apocalyptic number.

78317290 is a deficient number, since it is larger than the sum of its proper divisors (64965950).

78317290 is a wasteful number, since it uses less digits than its factorization.

78317290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128457.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 78317290 is about 8849.7056448223. The cubic root of 78317290 is about 427.8444313348.

The spelling of 78317290 in words is "seventy-eight million, three hundred seventeen thousand, two hundred ninety".