81485604 has 36 divisors (see below), whose sum is σ = 216820240. Its totient is φ = 25732080.

The previous prime is 81485561. The next prime is 81485609. The reversal of 81485604 is 40658418.

81485604 is a `hidden beast` number, since 8 + 1 + 48 + 5 + 604 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (81485609) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58882 + ... + 60249.

Almost surely, 2^81485604 is an apocalyptic number.

It is an amenable number.

81485604 is an abundant number, since it is smaller than the sum of its proper divisors (135334636).

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

81485604 is a wasteful number, since it uses less digits than its factorization.

81485604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119160 (or 119155 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 81485604 is about 9026.9376867241. The cubic root of 81485604 is about 433.5377935864.

The spelling of 81485604 in words is "eighty-one million, four hundred eighty-five thousand, six hundred four".