65015520 has 48 divisors (see below), whose sum is σ = 204800400. Its totient is φ = 17337344.

The previous prime is 65015513. The next prime is 65015521. The reversal of 65015520 is 2551056.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65015521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67245 + ... + 68204.

It is an arithmetic number, because the mean of its divisors is an integer number (4266675).

Almost surely, 2^65015520 is an apocalyptic number.

65015520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65015520 is an abundant number, since it is smaller than the sum of its proper divisors (139784880).

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

65015520 is a wasteful number, since it uses less digits than its factorization.

65015520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135467 (or 135459 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 65015520 is about 8063.2202003914. The cubic root of 65015520 is about 402.1045741655.

Adding to 65015520 its reverse (2551056), we get a palindrome (67566576).

It can be divided in two parts, 6501 and 5520, that added together give a palindrome (12021).

The spelling of 65015520 in words is "sixty-five million, fifteen thousand, five hundred twenty".