50981640 has 128 divisors (see below), whose sum is σ = 164799360. Its totient is φ = 12570624.

The previous prime is 50981629. The next prime is 50981641. The reversal of 50981640 is 4618905.

It is not an unprimeable number, because it can be changed into a prime (50981641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 136494 + ... + 136866.

It is an arithmetic number, because the mean of its divisors is an integer number (1287495).

Almost surely, 2^50981640 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 50981640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82399680).

50981640 is an abundant number, since it is smaller than the sum of its proper divisors (113817720).

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

50981640 is a wasteful number, since it uses less digits than its factorization.

50981640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471 (or 467 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 50981640 is about 7140.1428557137. The cubic root of 50981640 is about 370.7984704282.

The spelling of 50981640 in words is "fifty million, nine hundred eighty-one thousand, six hundred forty".