81524080 has 40 divisors (see below), whose sum is σ = 206776944. Its totient is φ = 29644800.

The previous prime is 81524063. The next prime is 81524083. The reversal of 81524080 is 8042518.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81524083) 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, 45441 + ... + 47200.

Almost surely, 2^81524080 is an apocalyptic number.

81524080 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81524080 is an abundant number, since it is smaller than the sum of its proper divisors (125252864).

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

81524080 is a wasteful number, since it uses less digits than its factorization.

81524080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92665 (or 92659 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 81524080 is about 9029.0686119887. The cubic root of 81524080 is about 433.6060190338.

Adding to 81524080 its reverse (8042518), we get a palindrome (89566598).

The spelling of 81524080 in words is "eighty-one million, five hundred twenty-four thousand, eighty".