4256621064 has 32 divisors (see below), whose sum is σ = 11823948000. Its totient is φ = 1418873616.

The previous prime is 4256621059. The next prime is 4256621077. The reversal of 4256621064 is 4601266524.

4256621064 is a `hidden beast` number, since 4 + 25 + 6 + 621 + 0 + 6 + 4 = 666.

It is a super-3 number, since 3×4256621064³ (a number of 30 digits) contains 333 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9853074 + ... + 9853505.

It is an arithmetic number, because the mean of its divisors is an integer number (369498375).

Almost surely, 2^4256621064 is an apocalyptic number.

It is an amenable number.

4256621064 is an abundant number, since it is smaller than the sum of its proper divisors (7567326936).

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

4256621064 is a wasteful number, since it uses less digits than its factorization.

4256621064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19706594 (or 19706584 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 4256621064 is about 65242.7855321951. The cubic root of 4256621064 is about 1620.6466280075.

Adding to 4256621064 its reverse (4601266524), we get a palindrome (8857887588).

The spelling of 4256621064 in words is "four billion, two hundred fifty-six million, six hundred twenty-one thousand, sixty-four".