81470928 has 240 divisors, whose sum is σ = 276839424. Its totient is φ = 20401920.

The previous prime is 81470927. The next prime is 81470951. The reversal of 81470928 is 82907418.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81470927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1215951 + ... + 1216017.

Almost surely, 2^81470928 is an apocalyptic number.

81470928 is a gapful number since it is divisible by the number (88) 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 81470928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138419712).

81470928 is an abundant number, since it is smaller than the sum of its proper divisors (195368496).

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

81470928 is a wasteful number, since it uses less digits than its factorization.

81470928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 81470928 is about 9026.1247498580. The cubic root of 81470928 is about 433.5117645196.

The spelling of 81470928 in words is "eighty-one million, four hundred seventy thousand, nine hundred twenty-eight".