64653500 has 48 divisors (see below), whose sum is σ = 142152192. Its totient is φ = 25688000.

The previous prime is 64653497. The next prime is 64653509. The reversal of 64653500 is 535646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64653509) 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, 95162 + ... + 95838.

It is an arithmetic number, because the mean of its divisors is an integer number (2961504).

Almost surely, 2^64653500 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 64653500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71076096).

64653500 is an abundant number, since it is smaller than the sum of its proper divisors (77498692).

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

64653500 is a wasteful number, since it uses less digits than its factorization.

64653500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887 (or 875 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 64653500 is about 8040.7400156951. The cubic root of 64653500 is about 401.3568505208.

The spelling of 64653500 in words is "sixty-four million, six hundred fifty-three thousand, five hundred".