51456648 has 32 divisors (see below), whose sum is σ = 128836800. Its totient is φ = 17126208.

The previous prime is 51456631. The next prime is 51456649. The reversal of 51456648 is 84665415.

It is a happy number.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (51456649) 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, 20890 + ... + 23222.

It is an arithmetic number, because the mean of its divisors is an integer number (4026150).

Almost surely, 2^51456648 is an apocalyptic number.

It is an amenable number.

51456648 is an abundant number, since it is smaller than the sum of its proper divisors (77380152).

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

51456648 is a wasteful number, since it uses less digits than its factorization.

51456648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3261 (or 3257 counting only the distinct ones).

The product of its digits is 115200, while the sum is 39.

The square root of 51456648 is about 7173.3289343233. The cubic root of 51456648 is about 371.9465179212.

The spelling of 51456648 in words is "fifty-one million, four hundred fifty-six thousand, six hundred forty-eight".