53335781 has 16 divisors (see below), whose sum is σ = 57446400. Its totient is φ = 49397040.

The previous prime is 53335757. The next prime is 53335801. The reversal of 53335781 is 18753335.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53335781 is a prime.

It is a super-2 number, since 2×53335781² = 5689411069759922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53335721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196676 + ... + 196946.

It is an arithmetic number, because the mean of its divisors is an integer number (3590400).

Almost surely, 2^53335781 is an apocalyptic number.

It is an amenable number.

53335781 is a deficient number, since it is larger than the sum of its proper divisors (4110619).

53335781 is a wasteful number, since it uses less digits than its factorization.

53335781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536.

The product of its digits is 37800, while the sum is 35.

The square root of 53335781 is about 7303.1350117604. The cubic root of 53335781 is about 376.4201698206.

The spelling of 53335781 in words is "fifty-three million, three hundred thirty-five thousand, seven hundred eighty-one".