51246720 has 384 divisors, whose sum is σ = 213857280. Its totient is φ = 11059200.

The previous prime is 51246703. The next prime is 51246733. The reversal of 51246720 is 2764215.

It is a tau number, because it is divible by the number of its divisors (384).

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, 1249900 + ... + 1249940.

It is an arithmetic number, because the mean of its divisors is an integer number (556920).

Almost surely, 2^51246720 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 51246720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106928640).

51246720 is an abundant number, since it is smaller than the sum of its proper divisors (162610560).

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

51246720 is a wasteful number, since it uses less digits than its factorization.

51246720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 51246720 is about 7158.6814428357. The cubic root of 51246720 is about 371.4400176805.

The spelling of 51246720 in words is "fifty-one million, two hundred forty-six thousand, seven hundred twenty".