81450408 has 32 divisors (see below), whose sum is σ = 219290400. Its totient is φ = 25061568.

The previous prime is 81450401. The next prime is 81450427. The reversal of 81450408 is 80405418.

It is not an unprimeable number, because it can be changed into a prime (81450401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130218 + ... + 130841.

It is an arithmetic number, because the mean of its divisors is an integer number (6852825).

Almost surely, 2^81450408 is an apocalyptic number.

It is an amenable number.

81450408 is an abundant number, since it is smaller than the sum of its proper divisors (137839992).

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

81450408 is a wasteful number, since it uses less digits than its factorization.

81450408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261081 (or 261077 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 81450408 is about 9024.9879778313. The cubic root of 81450408 is about 433.4753654074.

The spelling of 81450408 in words is "eighty-one million, four hundred fifty thousand, four hundred eight".