53786781 has 16 divisors (see below), whose sum is σ = 79804800. Its totient is φ = 35803584.

The previous prime is 53786773. The next prime is 53786783. The reversal of 53786781 is 18768735.

It is not a de Polignac number, because 53786781 - 2³ = 53786773 is a prime.

It is a super-2 number, since 2×53786781² = 5786035620683922, 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 (53786783) 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, 25360 + ... + 27398.

It is an arithmetic number, because the mean of its divisors is an integer number (4987800).

Almost surely, 2^53786781 is an apocalyptic number.

It is an amenable number.

53786781 is a deficient number, since it is larger than the sum of its proper divisors (26018019).

53786781 is a wasteful number, since it uses less digits than its factorization.

53786781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3025 (or 3019 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 53786781 is about 7333.9471637039. The cubic root of 53786781 is about 377.4781789355.

The spelling of 53786781 in words is "fifty-three million, seven hundred eighty-six thousand, seven hundred eighty-one".