51061920 has 288 divisors, whose sum is σ = 202704768. Its totient is φ = 10708992.

The previous prime is 51061919. The next prime is 51061937. The reversal of 51061920 is 2916015.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 305677 + ... + 305843.

It is an arithmetic number, because the mean of its divisors is an integer number (703836).

Almost surely, 2^51061920 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 51061920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101352384).

51061920 is an abundant number, since it is smaller than the sum of its proper divisors (151642848).

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

51061920 is a wasteful number, since it uses less digits than its factorization.

51061920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212 (or 197 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 51061920 is about 7145.7623806001. The cubic root of 51061920 is about 370.9929985625.

Adding to 51061920 its reverse (2916015), we get a palindrome (53977935).

The spelling of 51061920 in words is "fifty-one million, sixty-one thousand, nine hundred twenty".