53640321 has 32 divisors (see below), whose sum is σ = 87494400. Its totient is φ = 28532736.

The previous prime is 53640319. The next prime is 53640329. The reversal of 53640321 is 12304635.

It is a happy number.

It is not a de Polignac number, because 53640321 - 2¹ = 53640319 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 53640291 and 53640300.

It is not an unprimeable number, because it can be changed into a prime (53640329) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33855 + ... + 35403.

It is an arithmetic number, because the mean of its divisors is an integer number (2734200).

Almost surely, 2^53640321 is an apocalyptic number.

53640321 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

53640321 is a deficient number, since it is larger than the sum of its proper divisors (33854079).

53640321 is a wasteful number, since it uses less digits than its factorization.

53640321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1673.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 53640321 is about 7323.9552838613. The cubic root of 53640321 is about 377.1352464070.

Adding to 53640321 its reverse (12304635), we get a palindrome (65944956).

The spelling of 53640321 in words is "fifty-three million, six hundred forty thousand, three hundred twenty-one".