64325640 has 128 divisors (see below), whose sum is σ = 206064000. Its totient is φ = 16017408.

The previous prime is 64325609. The next prime is 64325669. The reversal of 64325640 is 4652346.

It is a super-2 number, since 2×64325640² = 8275575922819200, which contains 22 as substring.

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 = 64325598 and 64325607.

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, 202762 + ... + 203078.

It is an arithmetic number, because the mean of its divisors is an integer number (1609875).

Almost surely, 2^64325640 is an apocalyptic number.

64325640 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 64325640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103032000).

64325640 is an abundant number, since it is smaller than the sum of its proper divisors (141738360).

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

64325640 is a wasteful number, since it uses less digits than its factorization.

64325640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439 (or 435 counting only the distinct ones).

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

The square root of 64325640 is about 8020.3266766386. The cubic root of 64325640 is about 400.6772692852.

Adding to 64325640 its reverse (4652346), we get a palindrome (68977986).

The spelling of 64325640 in words is "sixty-four million, three hundred twenty-five thousand, six hundred forty".