81524396 has 12 divisors (see below), whose sum is σ = 142793448. Its totient is φ = 40726272.

The previous prime is 81524393. The next prime is 81524407. The reversal of 81524396 is 69342518.

It is a happy number.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (81524393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3506 + ... + 13241.

It is an arithmetic number, because the mean of its divisors is an integer number (11899454).

Almost surely, 2^81524396 is an apocalyptic number.

It is an amenable number.

81524396 is a deficient number, since it is larger than the sum of its proper divisors (61269052).

81524396 is a wasteful number, since it uses less digits than its factorization.

81524396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17968 (or 17966 counting only the distinct ones).

The product of its digits is 51840, while the sum is 38.

The square root of 81524396 is about 9029.0861110081. The cubic root of 81524396 is about 433.6065792745.

The spelling of 81524396 in words is "eighty-one million, five hundred twenty-four thousand, three hundred ninety-six".