64540 has 24 divisors (see below), whose sum is σ = 155232. Its totient is φ = 22080.

The previous prime is 64513. The next prime is 64553. The reversal of 64540 is 4546.

64540 = 93² + 94² + ... + 99².

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91 + ... + 370.

It is an arithmetic number, because the mean of its divisors is an integer number (6468).

2⁶⁴⁵⁴⁰ is an apocalyptic number.

It is an amenable number.

64540 is an abundant number, since it is smaller than the sum of its proper divisors (90692).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77616).

64540 is a wasteful number, since it uses less digits than its factorization.

64540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477 (or 475 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 64540 is about 254.0472397016. The cubic root of 64540 is about 40.1121850686.

The spelling of 64540 in words is "sixty-four thousand, five hundred forty".