65940660 has 72 divisors (see below), whose sum is σ = 205446696. Its totient is φ = 17107200.

The previous prime is 65940617. The next prime is 65940691. The reversal of 65940660 is 6604956.

It is a happy number.

65940660 is a `hidden beast` number, since 6 + 594 + 0 + 6 + 60 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 36650916 + 29289744 = 6054^2 + 5412^2 .

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

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, 1710 + ... + 11610.

Almost surely, 2^65940660 is an apocalyptic number.

65940660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65940660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102723348).

65940660 is an abundant number, since it is smaller than the sum of its proper divisors (139506036).

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

65940660 is a wasteful number, since it uses less digits than its factorization.

65940660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9953 (or 9948 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 65940660 is about 8120.3854588314. The cubic root of 65940660 is about 404.0028510076.

The spelling of 65940660 in words is "sixty-five million, nine hundred forty thousand, six hundred sixty".