65140320 has 96 divisors (see below), whose sum is σ = 234517248. Its totient is φ = 14888448.

The previous prime is 65140289. The next prime is 65140363. The reversal of 65140320 is 2304156.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×65140320² = 8486522579404800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

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, 6334 + ... + 13053.

It is an arithmetic number, because the mean of its divisors is an integer number (2442888).

Almost surely, 2^65140320 is an apocalyptic number.

65140320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65140320 is an abundant number, since it is smaller than the sum of its proper divisors (169376928).

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

65140320 is a wasteful number, since it uses less digits than its factorization.

65140320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19412 (or 19404 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 65140320 is about 8070.9553337879. The cubic root of 65140320 is about 402.3616952130.

Adding to 65140320 its reverse (2304156), we get a palindrome (67444476).

The spelling of 65140320 in words is "sixty-five million, one hundred forty thousand, three hundred twenty".