64740 has 48 divisors (see below), whose sum is σ = 197568. Its totient is φ = 15744.

The previous prime is 64717. The next prime is 64747. The reversal of 64740 is 4746.

64740 = T₈ + T₉ + ... + T₇₂.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64747) by changing a digit.

64740 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 739 + ... + 821.

It is an arithmetic number, because the mean of its divisors is an integer number (4116).

2⁶⁴⁷⁴⁰ is an apocalyptic number.

64740 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 64740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98784).

64740 is an abundant number, since it is smaller than the sum of its proper divisors (132828).

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

64740 is a wasteful number, since it uses less digits than its factorization.

64740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 106 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 64740 is about 254.4405628040. The cubic root of 64740 is about 40.1535762703.

The spelling of 64740 in words is "sixty-four thousand, seven hundred forty".