64540008 has 96 divisors (see below), whose sum is σ = 191940840. Its totient is φ = 19468800.

The previous prime is 64539997. The next prime is 64540009. The reversal of 64540008 is 80004546.

It can be written as a sum of positive squares in 4 ways, for example, as 28323684 + 36216324 = 5322^2 + 6018^2 .

It is not an unprimeable number, because it can be changed into a prime (64540009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48958 + ... + 50258.

Almost surely, 2^64540008 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 64540008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95970420).

64540008 is an abundant number, since it is smaller than the sum of its proper divisors (127400832).

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

64540008 is a wasteful number, since it uses less digits than its factorization.

64540008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379 (or 1372 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 64540008 is about 8033.6796052618. The cubic root of 64540008 is about 401.1218672597.

The spelling of 64540008 in words is "sixty-four million, five hundred forty thousand, eight".