81222032 has 10 divisors (see below), whose sum is σ = 157367718. Its totient is φ = 40611008.

The previous prime is 81222019. The next prime is 81222059. The reversal of 81222032 is 23022218.

It can be written as a sum of positive squares in only one way, i.e., 64705936 + 16516096 = 8044^2 + 4064^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81221995 and 81222013.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2538173 + ... + 2538204.

Almost surely, 2^81222032 is an apocalyptic number.

It is an amenable number.

81222032 is a deficient number, since it is larger than the sum of its proper divisors (76145686).

81222032 is a wasteful number, since it uses less digits than its factorization.

81222032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5076385 (or 5076379 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 81222032 is about 9012.3266696231. The cubic root of 81222032 is about 433.0698506076.

The spelling of 81222032 in words is "eighty-one million, two hundred twenty-two thousand, thirty-two".