51644268 has 72 divisors (see below), whose sum is σ = 141658608. Its totient is φ = 15769728.

The previous prime is 51644251. The next prime is 51644279. The reversal of 51644268 is 86244615.

51644268 is a `hidden beast` number, since 5 + 1 + 644 + 2 + 6 + 8 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75946 + ... + 76622.

Almost surely, 2^51644268 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 51644268, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70829304).

51644268 is an abundant number, since it is smaller than the sum of its proper divisors (90014340).

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

51644268 is a wasteful number, since it uses less digits than its factorization.

51644268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863 (or 858 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 51644268 is about 7186.3946454394. The cubic root of 51644268 is about 372.3980304347.

The spelling of 51644268 in words is "fifty-one million, six hundred forty-four thousand, two hundred sixty-eight".