51002644 has 48 divisors (see below), whose sum is σ = 113895936. Its totient is φ = 19404000.

The previous prime is 51002639. The next prime is 51002671. The reversal of 51002644 is 44620015.

It is a Harshad number since it is a multiple of its sum of digits (22).

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 15 ways as a sum of consecutive naturals, for example, 11319 + ... + 15169.

It is an arithmetic number, because the mean of its divisors is an integer number (2372832).

Almost surely, 2^51002644 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 51002644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56947968).

51002644 is an abundant number, since it is smaller than the sum of its proper divisors (62893292).

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

51002644 is a wasteful number, since it uses less digits than its factorization.

51002644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3916 (or 3914 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 51002644 is about 7141.6135431708. The cubic root of 51002644 is about 370.8493853703.

Adding to 51002644 its reverse (44620015), we get a palindrome (95622659).

It can be divided in two parts, 5100 and 2644, that added together give a square (7744 = 88²).

The spelling of 51002644 in words is "fifty-one million, two thousand, six hundred forty-four".