65707920 has 120 divisors (see below), whose sum is σ = 222146496. Its totient is φ = 17405184.

The previous prime is 65707903. The next prime is 65707921. The reversal of 65707920 is 2970756.

It is a tau number, because it is divible by the number of its divisors (120).

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

It is not an unprimeable number, because it can be changed into a prime (65707921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 189187 + ... + 189533.

Almost surely, 2^65707920 is an apocalyptic number.

65707920 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 65707920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111073248).

65707920 is an abundant number, since it is smaller than the sum of its proper divisors (156438576).

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

65707920 is a wasteful number, since it uses less digits than its factorization.

65707920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629 (or 620 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The square root of 65707920 is about 8106.0421908599. The cubic root of 65707920 is about 403.5269763569.

The spelling of 65707920 in words is "sixty-five million, seven hundred seven thousand, nine hundred twenty".