64521036 has 120 divisors (see below), whose sum is σ = 182138880. Its totient is φ = 19852128.

The previous prime is 64521031. The next prime is 64521047. The reversal of 64521036 is 63012546.

64521036 is a `hidden beast` number, since 645 + 2 + 10 + 3 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64521031) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 289221 + ... + 289443.

It is an arithmetic number, because the mean of its divisors is an integer number (1517824).

Almost surely, 2^64521036 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 64521036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91069440).

64521036 is an abundant number, since it is smaller than the sum of its proper divisors (117617844).

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

64521036 is a wasteful number, since it uses less digits than its factorization.

64521036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305 (or 294 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 64521036 is about 8032.4987394957. The cubic root of 64521036 is about 401.0825591876.

The spelling of 64521036 in words is "sixty-four million, five hundred twenty-one thousand, thirty-six".