81529304 has 16 divisors (see below), whose sum is σ = 160913400. Its totient is φ = 38619072.

The previous prime is 81529303. The next prime is 81529313. The reversal of 81529304 is 40392518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81529303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268037 + ... + 268340.

Almost surely, 2^81529304 is an apocalyptic number.

It is an amenable number.

81529304 is a deficient number, since it is larger than the sum of its proper divisors (79384096).

81529304 is a wasteful number, since it uses less digits than its factorization.

81529304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536402 (or 536398 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 81529304 is about 9029.3578952216. The cubic root of 81529304 is about 433.6152805488.

The spelling of 81529304 in words is "eighty-one million, five hundred twenty-nine thousand, three hundred four".