81479232 has 168 divisors, whose sum is σ = 253553976. Its totient is φ = 24920064.

The previous prime is 81479231. The next prime is 81479261. The reversal of 81479232 is 23297418.

It can be written as a sum of positive squares in 4 ways, for example, as 22127616 + 59351616 = 4704^2 + 7704^2 .

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

It is not an unprimeable number, because it can be changed into a prime (81479231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 518898 + ... + 519054.

Almost surely, 2^81479232 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 81479232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126776988).

81479232 is an abundant number, since it is smaller than the sum of its proper divisors (172074744).

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

81479232 is a wasteful number, since it uses less digits than its factorization.

81479232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245 (or 232 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 81479232 is about 9026.5847362111. The cubic root of 81479232 is about 433.5264927157.

The spelling of 81479232 in words is "eighty-one million, four hundred seventy-nine thousand, two hundred thirty-two".