64651626 has 72 divisors (see below), whose sum is σ = 154929996. Its totient is φ = 19468800.

The previous prime is 64651621. The next prime is 64651667. The reversal of 64651626 is 62615646.

It is a happy number.

64651626 is a `hidden beast` number, since 646 + 5 + 1 + 6 + 2 + 6 = 666.

64651626 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 36614601 + 28037025 = 6051^2 + 5295^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64651621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 161026 + ... + 161426.

Almost surely, 2^64651626 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64651626, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77464998).

64651626 is an abundant number, since it is smaller than the sum of its proper divisors (90278370).

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

64651626 is a wasteful number, since it uses less digits than its factorization.

64651626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488 (or 472 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 64651626 is about 8040.6234832878. The cubic root of 64651626 is about 401.3529726693.

The spelling of 64651626 in words is "sixty-four million, six hundred fifty-one thousand, six hundred twenty-six".