65490320 has 80 divisors (see below), whose sum is σ = 176238720. Its totient is φ = 22167552.

The previous prime is 65490281. The next prime is 65490331. The reversal of 65490320 is 2309456.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45776 + ... + 47184.

It is an arithmetic number, because the mean of its divisors is an integer number (2202984).

Almost surely, 2^65490320 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 65490320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88119360).

65490320 is an abundant number, since it is smaller than the sum of its proper divisors (110748400).

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

65490320 is a wasteful number, since it uses less digits than its factorization.

65490320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1512 (or 1506 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 65490320 is about 8092.6089736253. The cubic root of 65490320 is about 403.0810403761.

Adding to 65490320 its reverse (2309456), we get a palindrome (67799776).

The spelling of 65490320 in words is "sixty-five million, four hundred ninety thousand, three hundred twenty".