65631280 has 80 divisors (see below), whose sum is σ = 179301024. Its totient is φ = 22026240.

The previous prime is 65631253. The next prime is 65631281. The reversal of 65631280 is 8213656.

65631280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 (65631281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8572 + ... + 14308.

Almost surely, 2^65631280 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65631280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89650512).

65631280 is an abundant number, since it is smaller than the sum of its proper divisors (113669744).

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

65631280 is a wasteful number, since it uses less digits than its factorization.

65631280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5774 (or 5768 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 65631280 is about 8101.3134737523. The cubic root of 65631280 is about 403.3700275489.

The spelling of 65631280 in words is "sixty-five million, six hundred thirty-one thousand, two hundred eighty".