64324540 has 48 divisors (see below), whose sum is σ = 155054592. Its totient is φ = 21957696.

The previous prime is 64324511. The next prime is 64324541. The reversal of 64324540 is 4542346.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 64324499 and 64324508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64324541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35947 + ... + 37693.

It is an arithmetic number, because the mean of its divisors is an integer number (3230304).

Almost surely, 2^64324540 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 64324540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77527296).

64324540 is an abundant number, since it is smaller than the sum of its proper divisors (90730052).

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

64324540 is a wasteful number, since it uses less digits than its factorization.

64324540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2026 (or 2024 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

The square root of 64324540 is about 8020.2581005850. The cubic root of 64324540 is about 400.6749853463.

Adding to 64324540 its reverse (4542346), we get a palindrome (68866886).

The spelling of 64324540 in words is "sixty-four million, three hundred twenty-four thousand, five hundred forty".