51947648 has 32 divisors (see below), whose sum is σ = 109581660. Its totient is φ = 24444928.

The previous prime is 51947641. The next prime is 51947669. The reversal of 51947648 is 84674915.

It can be written as a sum of positive squares in 2 ways, for example, as 51724864 + 222784 = 7192^2 + 472^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 51947599 and 51947608.

It is not an unprimeable number, because it can be changed into a prime (51947641) 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, 9761 + ... + 14112.

Almost surely, 2^51947648 is an apocalyptic number.

It is an amenable number.

51947648 is an abundant number, since it is smaller than the sum of its proper divisors (57634012).

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

51947648 is a wasteful number, since it uses less digits than its factorization.

51947648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23904 (or 23892 counting only the distinct ones).

The product of its digits is 241920, while the sum is 44.

The square root of 51947648 is about 7207.4716787512. The cubic root of 51947648 is about 373.1258143763.

The spelling of 51947648 in words is "fifty-one million, nine hundred forty-seven thousand, six hundred forty-eight".