51783693 has 16 divisors (see below), whose sum is σ = 75578496. Its totient is φ = 31343040.

The previous prime is 51783689. The next prime is 51783713. The reversal of 51783693 is 39638715.

It is not a de Polignac number, because 51783693 - 2² = 51783689 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51783643) 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, 8505 + ... + 13262.

It is an arithmetic number, because the mean of its divisors is an integer number (4723656).

Almost surely, 2^51783693 is an apocalyptic number.

It is an amenable number.

51783693 is a deficient number, since it is larger than the sum of its proper divisors (23794803).

51783693 is a wasteful number, since it uses less digits than its factorization.

51783693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21844.

The product of its digits is 136080, while the sum is 42.

The square root of 51783693 is about 7196.0887293029. The cubic root of 51783693 is about 372.7328526250.

The spelling of 51783693 in words is "fifty-one million, seven hundred eighty-three thousand, six hundred ninety-three".