53781905 has 16 divisors (see below), whose sum is σ = 67287360. Its totient is φ = 41228352.

The previous prime is 53781901. The next prime is 53781911. The reversal of 53781905 is 50918735.

It is a cyclic number.

It is not a de Polignac number, because 53781905 - 2² = 53781901 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53781901) 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, 10226 + ... + 14564.

It is an arithmetic number, because the mean of its divisors is an integer number (4205460).

Almost surely, 2^53781905 is an apocalyptic number.

It is an amenable number.

53781905 is a deficient number, since it is larger than the sum of its proper divisors (13505455).

53781905 is a wasteful number, since it uses less digits than its factorization.

53781905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4448.

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 53781905 is about 7333.6147294496. The cubic root of 53781905 is about 377.4667719244.

The spelling of 53781905 in words is "fifty-three million, seven hundred eighty-one thousand, nine hundred five".