65287920 has 80 divisors (see below), whose sum is σ = 203558400. Its totient is φ = 17309952.

The previous prime is 65287913. The next prime is 65287927. The reversal of 65287920 is 2978256.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (65287913) and next prime (65287927).

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65287927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47077 + ... + 48443.

It is an arithmetic number, because the mean of its divisors is an integer number (2544480).

Almost surely, 2^65287920 is an apocalyptic number.

65287920 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 65287920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101779200).

65287920 is an abundant number, since it is smaller than the sum of its proper divisors (138270480).

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

65287920 is a wasteful number, since it uses less digits than its factorization.

65287920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1582 (or 1576 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 65287920 is about 8080.0940588585. The cubic root of 65287920 is about 402.6653667682.

The spelling of 65287920 in words is "sixty-five million, two hundred eighty-seven thousand, nine hundred twenty".