64491336 has 256 divisors, whose sum is σ = 234662400. Its totient is φ = 15925248.

The previous prime is 64491311. The next prime is 64491337. The reversal of 64491336 is 63319446.

64491336 is a `hidden beast` number, since 644 + 9 + 1 + 3 + 3 + 6 = 666.

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

It is a nude number because it is divisible by every one of its digits.

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 64491336.

It is not an unprimeable number, because it can be changed into a prime (64491337) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 334056 + ... + 334248.

It is an arithmetic number, because the mean of its divisors is an integer number (916650).

Almost surely, 2^64491336 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 64491336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117331200).

64491336 is an abundant number, since it is smaller than the sum of its proper divisors (170171064).

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

64491336 is a wasteful number, since it uses less digits than its factorization.

64491336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245 (or 235 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The square root of 64491336 is about 8030.6497869101. The cubic root of 64491336 is about 401.0210083044.

The spelling of 64491336 in words is "sixty-four million, four hundred ninety-one thousand, three hundred thirty-six".