64421136 has 80 divisors (see below), whose sum is σ = 199153920. Its totient is φ = 19820160.

The previous prime is 64421111. The next prime is 64421179. The reversal of 64421136 is 63112446.

64421136 is a `hidden beast` number, since 644 + 2 + 1 + 13 + 6 = 666.

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

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120 + ... + 11351.

It is an arithmetic number, because the mean of its divisors is an integer number (2489424).

Almost surely, 2^64421136 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 64421136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99576960).

64421136 is an abundant number, since it is smaller than the sum of its proper divisors (134732784).

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

64421136 is a wasteful number, since it uses less digits than its factorization.

64421136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11501 (or 11489 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 64421136 is about 8026.2778421881. The cubic root of 64421136 is about 400.8754492404.

The spelling of 64421136 in words is "sixty-four million, four hundred twenty-one thousand, one hundred thirty-six".