64540680 has 64 divisors (see below), whose sum is σ = 194616000. Its totient is φ = 17122560.

The previous prime is 64540669. The next prime is 64540681. The reversal of 64540680 is 8604546.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (64540681) 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, 24046 + ... + 26594.

It is an arithmetic number, because the mean of its divisors is an integer number (3040875).

Almost surely, 2^64540680 is an apocalyptic number.

64540680 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 64540680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97308000).

64540680 is an abundant number, since it is smaller than the sum of its proper divisors (130075320).

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

64540680 is a wasteful number, since it uses less digits than its factorization.

64540680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2774 (or 2770 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 64540680 is about 8033.7214290763. The cubic root of 64540680 is about 401.1232594347.

The spelling of 64540680 in words is "sixty-four million, five hundred forty thousand, six hundred eighty".