81480924 has 144 divisors (see below), whose sum is σ = 249933600. Its totient is φ = 22885632.

The previous prime is 81480913. The next prime is 81480937. The reversal of 81480924 is 42908418.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 470902 + ... + 471074.

It is an arithmetic number, because the mean of its divisors is an integer number (1735650).

Almost surely, 2^81480924 is an apocalyptic number.

81480924 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81480924, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124966800).

81480924 is an abundant number, since it is smaller than the sum of its proper divisors (168452676).

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

81480924 is a wasteful number, since it uses less digits than its factorization.

81480924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289 (or 274 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 81480924 is about 9026.6784588795. The cubic root of 81480924 is about 433.5294935693.

The spelling of 81480924 in words is "eighty-one million, four hundred eighty thousand, nine hundred twenty-four".