51228648 has 24 divisors (see below), whose sum is σ = 138744450. Its totient is φ = 17076192.

The previous prime is 51228643. The next prime is 51228649. The reversal of 51228648 is 84682215.

51228648 is a `hidden beast` number, since 5 + 1 + 2 + 2 + 8 + 648 = 666.

It can be written as a sum of positive squares in only one way, i.e., 49533444 + 1695204 = 7038^2 + 1302^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (51228643) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 355683 + ... + 355826.

Almost surely, 2^51228648 is an apocalyptic number.

It is an amenable number.

51228648 is an abundant number, since it is smaller than the sum of its proper divisors (87515802).

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

51228648 is a wasteful number, since it uses less digits than its factorization.

51228648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711521 (or 711514 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 51228648 is about 7157.4190879115. The cubic root of 51228648 is about 371.3963501494.

The spelling of 51228648 in words is "fifty-one million, two hundred twenty-eight thousand, six hundred forty-eight".