81823270 has 8 divisors (see below), whose sum is σ = 147281904. Its totient is φ = 32729304.

The previous prime is 81823267. The next prime is 81823271. The reversal of 81823270 is 7232818.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81823271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4091154 + ... + 4091173.

It is an arithmetic number, because the mean of its divisors is an integer number (18410238).

Almost surely, 2^81823270 is an apocalyptic number.

81823270 is a deficient number, since it is larger than the sum of its proper divisors (65458634).

81823270 is a wasteful number, since it uses less digits than its factorization.

81823270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8182334.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 81823270 is about 9045.6215927928. The cubic root of 81823270 is about 434.1358101731.

The spelling of 81823270 in words is "eighty-one million, eight hundred twenty-three thousand, two hundred seventy".