53705687 has 4 divisors (see below), whose sum is σ = 61377936. Its totient is φ = 46033440.

The previous prime is 53705683. The next prime is 53705689. The reversal of 53705687 is 78650735.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78650735 = 5 ⋅15730147.

It is a cyclic number.

It is not a de Polignac number, because 53705687 - 2² = 53705683 is a prime.

It is a super-2 number, since 2×53705687² = 5768601632283938, 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 (53705683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3836114 + ... + 3836127.

It is an arithmetic number, because the mean of its divisors is an integer number (15344484).

Almost surely, 2^53705687 is an apocalyptic number.

53705687 is a deficient number, since it is larger than the sum of its proper divisors (7672249).

53705687 is an equidigital number, since it uses as much as digits as its factorization.

53705687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7672248.

The product of its (nonzero) digits is 176400, while the sum is 41.

The square root of 53705687 is about 7328.4164046539. The cubic root of 53705687 is about 377.2883763366.

The spelling of 53705687 in words is "fifty-three million, seven hundred five thousand, six hundred eighty-seven".