51430644 has 72 divisors (see below), whose sum is σ = 144930240. Its totient is φ = 15282432.

The previous prime is 51430637. The next prime is 51430657. The reversal of 51430644 is 44603415.

51430644 is a `hidden beast` number, since 5 + 14 + 3 + 0 + 644 = 666.

It is a super-2 number, since 2×51430644² = 5290222284509472, which contains 22 as substring.

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, 9417 + ... + 13839.

It is an arithmetic number, because the mean of its divisors is an integer number (2012920).

Almost surely, 2^51430644 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 51430644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72465120).

51430644 is an abundant number, since it is smaller than the sum of its proper divisors (93499596).

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

51430644 is a wasteful number, since it uses less digits than its factorization.

51430644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4469 (or 4464 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 51430644 is about 7171.5161576894. The cubic root of 51430644 is about 371.8838520502.

The spelling of 51430644 in words is "fifty-one million, four hundred thirty thousand, six hundred forty-four".