51677687 has 4 divisors (see below), whose sum is σ = 52553640. Its totient is φ = 50801736.

The previous prime is 51677653. The next prime is 51677699. The reversal of 51677687 is 78677615.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51677687 - 2¹⁰ = 51676663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51677287) 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, 437888 + ... + 438005.

It is an arithmetic number, because the mean of its divisors is an integer number (13138410).

Almost surely, 2^51677687 is an apocalyptic number.

51677687 is a deficient number, since it is larger than the sum of its proper divisors (875953).

51677687 is an equidigital number, since it uses as much as digits as its factorization.

51677687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875952.

The product of its digits is 493920, while the sum is 47.

The square root of 51677687 is about 7188.7194269912. The cubic root of 51677687 is about 372.4783393558.

The spelling of 51677687 in words is "fifty-one million, six hundred seventy-seven thousand, six hundred eighty-seven".