665182840 has 96 divisors (see below), whose sum is σ = 1747154880. Its totient is φ = 227259648.

The previous prime is 665182823. The next prime is 665182853. The reversal of 665182840 is 48281566.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 665182793 and 665182802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 907114 + ... + 907846.

It is an arithmetic number, because the mean of its divisors is an integer number (18199530).

Almost surely, 2^665182840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665182840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (873577440).

665182840 is an abundant number, since it is smaller than the sum of its proper divisors (1081972040).

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

665182840 is a wasteful number, since it uses less digits than its factorization.

665182840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1221 (or 1210 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 665182840 is about 25791.1387883513. The cubic root of 665182840 is about 872.9318622967.

The spelling of 665182840 in words is "six hundred sixty-five million, one hundred eighty-two thousand, eight hundred forty".