81508976 has 10 divisors (see below), whose sum is σ = 157923672. Its totient is φ = 40754480.

The previous prime is 81508969. The next prime is 81508979. The reversal of 81508976 is 67980518.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81508979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2547140 + ... + 2547171.

Almost surely, 2^81508976 is an apocalyptic number.

It is an amenable number.

81508976 is a deficient number, since it is larger than the sum of its proper divisors (76414696).

81508976 is a wasteful number, since it uses less digits than its factorization.

81508976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5094319 (or 5094313 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 81508976 is about 9028.2321636077. The cubic root of 81508976 is about 433.5792392578.

The spelling of 81508976 in words is "eighty-one million, five hundred eight thousand, nine hundred seventy-six".