81450080 has 24 divisors (see below), whose sum is σ = 192426192. Its totient is φ = 32579968.

The previous prime is 81450073. The next prime is 81450119. The reversal of 81450080 is 8005418.

It is a congruent number.

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, 254372 + ... + 254691.

It is an arithmetic number, because the mean of its divisors is an integer number (8017758).

Almost surely, 2^81450080 is an apocalyptic number.

81450080 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81450080 is an abundant number, since it is smaller than the sum of its proper divisors (110976112).

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

81450080 is a wasteful number, since it uses less digits than its factorization.

81450080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509078 (or 509070 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 81450080 is about 9024.9698060437. The cubic root of 81450080 is about 433.4747835396.

Adding to 81450080 its reverse (8005418), we get a palindrome (89455498).

The spelling of 81450080 in words is "eighty-one million, four hundred fifty thousand, eighty".