65840920 has 16 divisors (see below), whose sum is σ = 148142160. Its totient is φ = 26336352.

The previous prime is 65840897. The next prime is 65840953. The reversal of 65840920 is 2904856.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 822972 + ... + 823051.

It is an arithmetic number, because the mean of its divisors is an integer number (9258885).

Almost surely, 2^65840920 is an apocalyptic number.

It is an amenable number.

65840920 is an abundant number, since it is smaller than the sum of its proper divisors (82301240).

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

65840920 is a wasteful number, since it uses less digits than its factorization.

65840920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1646034 (or 1646030 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 65840920 is about 8114.2418006860. The cubic root of 65840920 is about 403.7990537453.

The spelling of 65840920 in words is "sixty-five million, eight hundred forty thousand, nine hundred twenty".