64231520 has 96 divisors (see below), whose sum is σ = 159667200. Its totient is φ = 24385536.

The previous prime is 64231513. The next prime is 64231537. The reversal of 64231520 is 2513246.

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, 505697 + ... + 505823.

It is an arithmetic number, because the mean of its divisors is an integer number (1663200).

Almost surely, 2^64231520 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 64231520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79833600).

64231520 is an abundant number, since it is smaller than the sum of its proper divisors (95435680).

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

64231520 is a wasteful number, since it uses less digits than its factorization.

64231520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280 (or 272 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 64231520 is about 8014.4569373102. The cubic root of 64231520 is about 400.4817528858.

Adding to 64231520 its reverse (2513246), we get a palindrome (66744766).

The spelling of 64231520 in words is "sixty-four million, two hundred thirty-one thousand, five hundred twenty".