8081645 has 32 divisors (see below), whose sum is σ = 11612160. Its totient is φ = 5322240.

The previous prime is 8081641. The next prime is 8081653. The reversal of 8081645 is 5461808.

It is not a de Polignac number, because 8081645 - 2² = 8081641 is a prime.

It is a super-3 number, since 3×8081645³ (a number of 22 digits) contains 333 as substring.

It is a Curzon number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8081641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63572 + ... + 63698.

It is an arithmetic number, because the mean of its divisors is an integer number (362880).

Almost surely, 2^8081645 is an apocalyptic number.

It is an amenable number.

8081645 is a deficient number, since it is larger than the sum of its proper divisors (3530515).

8081645 is a wasteful number, since it uses less digits than its factorization.

8081645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 8081645 is about 2842.8234204748. The cubic root of 8081645 is about 200.6780734837.

The spelling of 8081645 in words is "eight million, eighty-one thousand, six hundred forty-five".