64521672 has 64 divisors (see below), whose sum is σ = 166932480. Its totient is φ = 20768832.

The previous prime is 64521671. The next prime is 64521679. The reversal of 64521672 is 27612546.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (64521671) 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, 105993 + ... + 106599.

It is an arithmetic number, because the mean of its divisors is an integer number (2608320).

Almost surely, 2^64521672 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 64521672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83466240).

64521672 is an abundant number, since it is smaller than the sum of its proper divisors (102410808).

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

64521672 is a wasteful number, since it uses less digits than its factorization.

64521672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762 (or 758 counting only the distinct ones).

The product of its digits is 20160, while the sum is 33.

The square root of 64521672 is about 8032.5383285734. The cubic root of 64521672 is about 401.0838770403.

The spelling of 64521672 in words is "sixty-four million, five hundred twenty-one thousand, six hundred seventy-two".