81348472 has 8 divisors (see below), whose sum is σ = 152528400. Its totient is φ = 40674232.

The previous prime is 81348457. The next prime is 81348479. The reversal of 81348472 is 27484318.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81348479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5084272 + ... + 5084287.

It is an arithmetic number, because the mean of its divisors is an integer number (19066050).

Almost surely, 2^81348472 is an apocalyptic number.

It is an amenable number.

81348472 is a deficient number, since it is larger than the sum of its proper divisors (71179928).

81348472 is a wasteful number, since it uses less digits than its factorization.

81348472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10168565 (or 10168561 counting only the distinct ones).

The product of its digits is 43008, while the sum is 37.

The square root of 81348472 is about 9019.3387784249. The cubic root of 81348472 is about 433.2944569989.

The spelling of 81348472 in words is "eighty-one million, three hundred forty-eight thousand, four hundred seventy-two".