65681380 has 12 divisors (see below), whose sum is σ = 137930940. Its totient is φ = 26272544.

The previous prime is 65681359. The next prime is 65681381. The reversal of 65681380 is 8318656.

It can be written as a sum of positive squares in 2 ways, for example, as 13147876 + 52533504 = 3626^2 + 7248^2 .

It is not an unprimeable number, because it can be changed into a prime (65681381) 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, 1642015 + ... + 1642054.

It is an arithmetic number, because the mean of its divisors is an integer number (11494245).

Almost surely, 2^65681380 is an apocalyptic number.

It is an amenable number.

65681380 is an abundant number, since it is smaller than the sum of its proper divisors (72249560).

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

65681380 is a wasteful number, since it uses less digits than its factorization.

65681380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3284078 (or 3284076 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 65681380 is about 8104.4049750737. The cubic root of 65681380 is about 403.4726396895.

The spelling of 65681380 in words is "sixty-five million, six hundred eighty-one thousand, three hundred eighty".