65231520 has 48 divisors (see below), whose sum is σ = 205480800. Its totient is φ = 17394944.

The previous prime is 65231513. The next prime is 65231563. The reversal of 65231520 is 2513256.

65231520 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 (48).

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

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 67470 + ... + 68429.

It is an arithmetic number, because the mean of its divisors is an integer number (4280850).

Almost surely, 2^65231520 is an apocalyptic number.

65231520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65231520 is an abundant number, since it is smaller than the sum of its proper divisors (140249280).

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

65231520 is a wasteful number, since it uses less digits than its factorization.

65231520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135917 (or 135909 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 65231520 is about 8076.6032464149. The cubic root of 65231520 is about 402.5493837534.

Adding to 65231520 its reverse (2513256), we get a palindrome (67744776).

The spelling of 65231520 in words is "sixty-five million, two hundred thirty-one thousand, five hundred twenty".