51223728 has 40 divisors (see below), whose sum is σ = 133160128. Its totient is φ = 16967232.

The previous prime is 51223723. The next prime is 51223729. The reversal of 51223728 is 82732215.

It is a junction number, because it is equal to n+sod(n) for n = 51223695 and 51223704.

It is not an unprimeable number, because it can be changed into a prime (51223723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4551 + ... + 11097.

Almost surely, 2^51223728 is an apocalyptic number.

It is an amenable number.

51223728 is an abundant number, since it is smaller than the sum of its proper divisors (81936400).

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

51223728 is a wasteful number, since it uses less digits than its factorization.

51223728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6721 (or 6715 counting only the distinct ones).

The product of its digits is 6720, while the sum is 30.

The square root of 51223728 is about 7157.0753803492. The cubic root of 51223728 is about 371.3844601320.

The spelling of 51223728 in words is "fifty-one million, two hundred twenty-three thousand, seven hundred twenty-eight".