64326540 has 96 divisors (see below), whose sum is σ = 187407360. Its totient is φ = 16473600.

The previous prime is 64326539. The next prime is 64326583. The reversal of 64326540 is 4562346.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 64326498 and 64326507.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 194175 + ... + 194505.

It is an arithmetic number, because the mean of its divisors is an integer number (1952160).

Almost surely, 2^64326540 is an apocalyptic number.

64326540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64326540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93703680).

64326540 is an abundant number, since it is smaller than the sum of its proper divisors (123080820).

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

64326540 is a wasteful number, since it uses less digits than its factorization.

64326540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463 (or 461 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 64326540 is about 8020.3827838826. The cubic root of 64326540 is about 400.6791379432.

Adding to 64326540 its reverse (4562346), we get a palindrome (68888886).

The spelling of 64326540 in words is "sixty-four million, three hundred twenty-six thousand, five hundred forty".