81010504 has 32 divisors (see below), whose sum is σ = 154958400. Its totient is φ = 39695040.

The previous prime is 81010499. The next prime is 81010507. The reversal of 81010504 is 40501018.

It is a super-3 number, since 3×81010504³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (81010507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192214 + ... + 192634.

It is an arithmetic number, because the mean of its divisors is an integer number (4842450).

Almost surely, 2^81010504 is an apocalyptic number.

It is an amenable number.

81010504 is a deficient number, since it is larger than the sum of its proper divisors (73947896).

81010504 is a wasteful number, since it uses less digits than its factorization.

81010504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853 (or 849 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 81010504 is about 9000.5835366381. The cubic root of 81010504 is about 432.6935732338.

The spelling of 81010504 in words is "eighty-one million, ten thousand, five hundred four".