65709920 has 24 divisors (see below), whose sum is σ = 155240064. Its totient is φ = 26283904.

The previous prime is 65709907. The next prime is 65709929. The reversal of 65709920 is 2990756.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65709929) 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, 205184 + ... + 205503.

It is an arithmetic number, because the mean of its divisors is an integer number (6468336).

Almost surely, 2^65709920 is an apocalyptic number.

It is an amenable number.

65709920 is an abundant number, since it is smaller than the sum of its proper divisors (89530144).

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

65709920 is a wasteful number, since it uses less digits than its factorization.

65709920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410702 (or 410694 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 65709920 is about 8106.1655546874. The cubic root of 65709920 is about 403.5310704639.

The spelling of 65709920 in words is "sixty-five million, seven hundred nine thousand, nine hundred twenty".