64391472 has 60 divisors (see below), whose sum is σ = 181559560. Its totient is φ = 21302784.

The previous prime is 64391471. The next prime is 64391519. The reversal of 64391472 is 27419346.

64391472 is a `hidden beast` number, since 643 + 9 + 1 + 4 + 7 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (64391471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18408 + ... + 21624.

Almost surely, 2^64391472 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 64391472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90779780).

64391472 is an abundant number, since it is smaller than the sum of its proper divisors (117168088).

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

64391472 is a wasteful number, since it uses less digits than its factorization.

64391472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3370 (or 3361 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 64391472 is about 8024.4296993618. The cubic root of 64391472 is about 400.8139094220.

The spelling of 64391472 in words is "sixty-four million, three hundred ninety-one thousand, four hundred seventy-two".