81968315 has 16 divisors (see below), whose sum is σ = 115559136. Its totient is φ = 55027200.

The previous prime is 81968303. The next prime is 81968321. The reversal of 81968315 is 51386918.

It is not a de Polignac number, because 81968315 - 2¹² = 81964219 is a prime.

It is a super-4 number, since 4×81968315⁴ (a number of 33 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56606 + ... + 58035.

It is an arithmetic number, because the mean of its divisors is an integer number (7222446).

Almost surely, 2^81968315 is an apocalyptic number.

81968315 is a deficient number, since it is larger than the sum of its proper divisors (33590821).

81968315 is a wasteful number, since it uses less digits than its factorization.

81968315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114670.

The product of its digits is 51840, while the sum is 41.

The square root of 81968315 is about 9053.6354576490. The cubic root of 81968315 is about 434.3921840932.

The spelling of 81968315 in words is "eighty-one million, nine hundred sixty-eight thousand, three hundred fifteen".