81222738 has 8 divisors (see below), whose sum is σ = 162445488. Its totient is φ = 27074244.

The previous prime is 81222703. The next prime is 81222797. The reversal of 81222738 is 83722218.

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

81222738 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 81222699 and 81222708.

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, 6768556 + ... + 6768567.

It is an arithmetic number, because the mean of its divisors is an integer number (20305686).

Almost surely, 2^81222738 is an apocalyptic number.

81222738 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81222738 is a wasteful number, since it uses less digits than its factorization.

81222738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13537128.

The product of its digits is 10752, while the sum is 33.

The square root of 81222738 is about 9012.3658381138. The cubic root of 81222738 is about 433.0711053838.

The spelling of 81222738 in words is "eighty-one million, two hundred twenty-two thousand, seven hundred thirty-eight".