81822068 has 12 divisors (see below), whose sum is σ = 144137952. Its totient is φ = 40639800.

The previous prime is 81822053. The next prime is 81822073. The reversal of 81822068 is 86022818.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67130 + ... + 68337.

It is an arithmetic number, because the mean of its divisors is an integer number (12011496).

Almost surely, 2^81822068 is an apocalyptic number.

It is an amenable number.

81822068 is a deficient number, since it is larger than the sum of its proper divisors (62315884).

81822068 is a wasteful number, since it uses less digits than its factorization.

81822068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135622 (or 135620 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 81822068 is about 9045.5551515648. Note that the first 3 decimals coincide. The cubic root of 81822068 is about 434.1336843157.

The spelling of 81822068 in words is "eighty-one million, eight hundred twenty-two thousand, sixty-eight".