165487640 has 32 divisors (see below), whose sum is σ = 373394880. Its totient is φ = 66008832.

The previous prime is 165487589. The next prime is 165487649. The reversal of 165487640 is 46784561.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165487649) 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, 9044 + ... + 20316.

It is an arithmetic number, because the mean of its divisors is an integer number (11668590).

Almost surely, 2^165487640 is an apocalyptic number.

165487640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165487640 is an abundant number, since it is smaller than the sum of its proper divisors (207907240).

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

165487640 is a wasteful number, since it uses less digits than its factorization.

165487640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11651 (or 11647 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 41.

The square root of 165487640 is about 12864.1999362572. The cubic root of 165487640 is about 549.0204492921.

The spelling of 165487640 in words is "one hundred sixty-five million, four hundred eighty-seven thousand, six hundred forty".