51444720 has 200 divisors, whose sum is σ = 189590544. Its totient is φ = 12883968.

The previous prime is 51444697. The next prime is 51444749. The reversal of 51444720 is 2744415.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 109927 + ... + 110393.

Almost surely, 2^51444720 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 51444720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94795272).

51444720 is an abundant number, since it is smaller than the sum of its proper divisors (138145824).

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

51444720 is a wasteful number, since it uses less digits than its factorization.

51444720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509 (or 494 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 27.

The square root of 51444720 is about 7172.4974729867. The cubic root of 51444720 is about 371.9177757917.

The spelling of 51444720 in words is "fifty-one million, four hundred forty-four thousand, seven hundred twenty".