81182604 has 12 divisors (see below), whose sum is σ = 189426104. Its totient is φ = 27060864.

The previous prime is 81182603. The next prime is 81182623. The reversal of 81182604 is 40628118.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (81182603) 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, 3382597 + ... + 3382620.

Almost surely, 2^81182604 is an apocalyptic number.

It is an amenable number.

81182604 is an abundant number, since it is smaller than the sum of its proper divisors (108243500).

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

81182604 is a wasteful number, since it uses less digits than its factorization.

81182604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6765224 (or 6765222 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 81182604 is about 9010.1389556432. The cubic root of 81182604 is about 432.9997635416. Note that the first 3 decimals are identical.

The spelling of 81182604 in words is "eighty-one million, one hundred eighty-two thousand, six hundred four".