81348630 has 32 divisors (see below), whose sum is σ = 212986368. Its totient is φ = 19720800.

The previous prime is 81348629. The next prime is 81348643. The reversal of 81348630 is 3684318.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 81348591 and 81348600.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 122926 + ... + 123585.

It is an arithmetic number, because the mean of its divisors is an integer number (6655824).

Almost surely, 2^81348630 is an apocalyptic number.

81348630 is an abundant number, since it is smaller than the sum of its proper divisors (131637738).

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

81348630 is a wasteful number, since it uses less digits than its factorization.

81348630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246532.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 81348630 is about 9019.3475373776. The cubic root of 81348630 is about 433.2947375224.

The spelling of 81348630 in words is "eighty-one million, three hundred forty-eight thousand, six hundred thirty".