51644064 has 48 divisors (see below), whose sum is σ = 137803680. Its totient is φ = 16930560.

The previous prime is 51644063. The next prime is 51644081. The reversal of 51644064 is 46044615.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (51644063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1447 + ... + 10265.

It is an arithmetic number, because the mean of its divisors is an integer number (2870910).

Almost surely, 2^51644064 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 51644064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68901840).

51644064 is an abundant number, since it is smaller than the sum of its proper divisors (86159616).

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

51644064 is a wasteful number, since it uses less digits than its factorization.

51644064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8893 (or 8885 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 51644064 is about 7186.3804519382. The cubic root of 51644064 is about 372.3975400977.

Adding to 51644064 its reverse (46044615), we get a palindrome (97688679).

The spelling of 51644064 in words is "fifty-one million, six hundred forty-four thousand, sixty-four".