81202028 has 6 divisors (see below), whose sum is σ = 142103556. Its totient is φ = 40601012.

The previous prime is 81202027. The next prime is 81202031. The reversal of 81202028 is 82020218.

It is a junction number, because it is equal to n+sod(n) for n = 81201994 and 81202012.

It is not an unprimeable number, because it can be changed into a prime (81202027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10150250 + ... + 10150257.

It is an arithmetic number, because the mean of its divisors is an integer number (23683926).

Almost surely, 2^81202028 is an apocalyptic number.

It is an amenable number.

81202028 is a deficient number, since it is larger than the sum of its proper divisors (60901528).

81202028 is a wasteful number, since it uses less digits than its factorization.

81202028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20300511 (or 20300509 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 81202028 is about 9011.2167879815. The cubic root of 81202028 is about 433.0342944070.

The spelling of 81202028 in words is "eighty-one million, two hundred two thousand, twenty-eight".