51333620 has 48 divisors (see below), whose sum is σ = 116847360. Its totient is φ = 18830976.

The previous prime is 51333619. The next prime is 51333637. The reversal of 51333620 is 2633315.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45989 + ... + 47091.

It is an arithmetic number, because the mean of its divisors is an integer number (2434320).

Almost surely, 2^51333620 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 51333620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58423680).

51333620 is an abundant number, since it is smaller than the sum of its proper divisors (65513740).

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

51333620 is a wasteful number, since it uses less digits than its factorization.

51333620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1304 (or 1302 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 23.

The square root of 51333620 is about 7164.7484254508. The cubic root of 51333620 is about 371.6498516616.

Adding to 51333620 its reverse (2633315), we get a palindrome (53966935).

The spelling of 51333620 in words is "fifty-one million, three hundred thirty-three thousand, six hundred twenty".