81332470 has 8 divisors (see below), whose sum is σ = 146398464. Its totient is φ = 32532984.

The previous prime is 81332467. The next prime is 81332473. The reversal of 81332470 is 7423318.

It is an interprime number because it is at equal distance from previous prime (81332467) and next prime (81332473).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×81332470² = 13229941352601800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81332473) 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 3 ways as a sum of consecutive naturals, for example, 4066614 + ... + 4066633.

It is an arithmetic number, because the mean of its divisors is an integer number (18299808).

Almost surely, 2^81332470 is an apocalyptic number.

81332470 is a deficient number, since it is larger than the sum of its proper divisors (65065994).

81332470 is a wasteful number, since it uses less digits than its factorization.

81332470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8133254.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 81332470 is about 9018.4516409415. The cubic root of 81332470 is about 433.2660441210.

Adding to 81332470 its reverse (7423318), we get a palindrome (88755788).

The spelling of 81332470 in words is "eighty-one million, three hundred thirty-two thousand, four hundred seventy".