51777728 has 28 divisors (see below), whose sum is σ = 103720392. Its totient is φ = 25643520.

The previous prime is 51777721. The next prime is 51777743. The reversal of 51777728 is 82777715.

It is not an unprimeable number, because it can be changed into a prime (51777721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3068 + ... + 10628.

Almost surely, 2^51777728 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 51777728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51860196).

51777728 is an abundant number, since it is smaller than the sum of its proper divisors (51942664).

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

51777728 is a wasteful number, since it uses less digits than its factorization.

51777728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7680 (or 7670 counting only the distinct ones).

The product of its digits is 192080, while the sum is 44.

The square root of 51777728 is about 7195.6742561069. The cubic root of 51777728 is about 372.7185402890.

The spelling of 51777728 in words is "fifty-one million, seven hundred seventy-seven thousand, seven hundred twenty-eight".