81629147704 has 32 divisors (see below), whose sum is σ = 164927196000. Its totient is φ = 37652337792.

The previous prime is 81629147701. The next prime is 81629147711. The reversal of 81629147704 is 40774192618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81629147701) 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 7 ways as a sum of consecutive naturals, for example, 61564 + ... + 408715.

It is an arithmetic number, because the mean of its divisors is an integer number (5153974875).

Almost surely, 2^81629147704 is an apocalyptic number.

It is an amenable number.

81629147704 is an abundant number, since it is smaller than the sum of its proper divisors (83298048296).

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

81629147704 is a wasteful number, since it uses less digits than its factorization.

81629147704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471967 (or 471963 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 49.

The spelling of 81629147704 in words is "eighty-one billion, six hundred twenty-nine million, one hundred forty-seven thousand, seven hundred four".