81816295 has 8 divisors (see below), whose sum is σ = 107105040. Its totient is φ = 59502720.

The previous prime is 81816289. The next prime is 81816307. The reversal of 81816295 is 59261818.

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

It is not a de Polignac number, because 81816295 - 2⁷ = 81816167 is a prime.

It is a super-2 number, since 2×81816295² = 13387812255054050, which contains 22 as substring.

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, 743730 + ... + 743839.

It is an arithmetic number, because the mean of its divisors is an integer number (13388130).

Almost surely, 2^81816295 is an apocalyptic number.

81816295 is a deficient number, since it is larger than the sum of its proper divisors (25288745).

81816295 is a wasteful number, since it uses less digits than its factorization.

81816295 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1487585.

The product of its digits is 34560, while the sum is 40.

The square root of 81816295 is about 9045.2360389323. The cubic root of 81816295 is about 434.1234738971.

The spelling of 81816295 in words is "eighty-one million, eight hundred sixteen thousand, two hundred ninety-five".