81267480 has 288 divisors, whose sum is σ = 326514240. Its totient is φ = 17418240.

The previous prime is 81267467. The next prime is 81267481. The reversal of 81267480 is 8476218.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81267481) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 299745 + ... + 300015.

It is an arithmetic number, because the mean of its divisors is an integer number (1133730).

Almost surely, 2^81267480 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81267480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163257120).

81267480 is an abundant number, since it is smaller than the sum of its proper divisors (245246760).

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

81267480 is a wasteful number, since it uses less digits than its factorization.

81267480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319 (or 305 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 81267480 is about 9014.8477524582. The cubic root of 81267480 is about 433.1506106680.

The spelling of 81267480 in words is "eighty-one million, two hundred sixty-seven thousand, four hundred eighty".