81020450 has 48 divisors (see below), whose sum is σ = 174363840. Its totient is φ = 27433920.

The previous prime is 81020431. The next prime is 81020473. The reversal of 81020450 is 5402018.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27656 + ... + 30444.

It is an arithmetic number, because the mean of its divisors is an integer number (3632580).

Almost surely, 2^81020450 is an apocalyptic number.

81020450 is an abundant number, since it is smaller than the sum of its proper divisors (93343390).

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

81020450 is a wasteful number, since it uses less digits than its factorization.

81020450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2891 (or 2886 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 81020450 is about 9001.1360394119. The cubic root of 81020450 is about 432.7112803786.

Adding to 81020450 its reverse (5402018), we get a palindrome (86422468).

The spelling of 81020450 in words is "eighty-one million, twenty thousand, four hundred fifty".