51647040 has 168 divisors, whose sum is σ = 180685440. Its totient is φ = 13538304.

The previous prime is 51647027. The next prime is 51647041. The reversal of 51647040 is 4074615.

51647040 = T₃₀₁ + T₃₀₂ + ... + T₆₉₅.

It is a junction number, because it is equal to n+sod(n) for n = 51646995 and 51647013.

It is not an unprimeable number, because it can be changed into a prime (51647041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 227407 + ... + 227633.

Almost surely, 2^51647040 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 51647040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90342720).

51647040 is an abundant number, since it is smaller than the sum of its proper divisors (129038400).

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

51647040 is a wasteful number, since it uses less digits than its factorization.

51647040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329 (or 316 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 51647040 is about 7186.5875072944. The cubic root of 51647040 is about 372.4046931223.

The spelling of 51647040 in words is "fifty-one million, six hundred forty-seven thousand, forty".