81670363 has 8 divisors (see below), whose sum is σ = 86840640. Its totient is φ = 76540800.

The previous prime is 81670333. The next prime is 81670367. The reversal of 81670363 is 36307618.

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

It is not a de Polignac number, because 81670363 - 2¹⁷ = 81539291 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81670367) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5988 + ... + 14113.

It is an arithmetic number, because the mean of its divisors is an integer number (10855080).

Almost surely, 2^81670363 is an apocalyptic number.

81670363 is a deficient number, since it is larger than the sum of its proper divisors (5170277).

81670363 is a wasteful number, since it uses less digits than its factorization.

81670363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20357.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 81670363 is about 9037.1656508000. The cubic root of 81670363 is about 433.8652115282.

The spelling of 81670363 in words is "eighty-one million, six hundred seventy thousand, three hundred sixty-three".