50978781 has 64 divisors (see below), whose sum is σ = 91238400. Its totient is φ = 27518400.

The previous prime is 50978749. The next prime is 50978783. The reversal of 50978781 is 18787905.

50978781 is a `hidden beast` number, since 509 + 78 + 78 + 1 = 666.

It is not a de Polignac number, because 50978781 - 2⁵ = 50978749 is a prime.

It is a super-2 number, since 2×50978781² = 5197672224491922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50978783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 389086 + ... + 389216.

It is an arithmetic number, because the mean of its divisors is an integer number (1425600).

Almost surely, 2^50978781 is an apocalyptic number.

It is an amenable number.

50978781 is a deficient number, since it is larger than the sum of its proper divisors (40259619).

50978781 is a wasteful number, since it uses less digits than its factorization.

50978781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247 (or 241 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The square root of 50978781 is about 7139.9426468285. The cubic root of 50978781 is about 370.7915389613.

The spelling of 50978781 in words is "fifty million, nine hundred seventy-eight thousand, seven hundred eighty-one".