81220602 has 16 divisors (see below), whose sum is σ = 162563040. Its totient is φ = 27053232.

The previous prime is 81220591. The next prime is 81220609. The reversal of 81220602 is 20602218.

It is not an unprimeable number, because it can be changed into a prime (81220609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5188 + ... + 13760.

It is an arithmetic number, because the mean of its divisors is an integer number (10160190).

Almost surely, 2^81220602 is an apocalyptic number.

81220602 is an abundant number, since it is smaller than the sum of its proper divisors (81342438).

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

81220602 is a wasteful number, since it uses less digits than its factorization.

81220602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10157.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 81220602 is about 9012.2473334901. The cubic root of 81220602 is about 433.0673090414.

The spelling of 81220602 in words is "eighty-one million, two hundred twenty thousand, six hundred two".