51678769 has 4 divisors (see below), whose sum is σ = 53925696. Its totient is φ = 49431844.

The previous prime is 51678761. The next prime is 51678791. The reversal of 51678769 is 96787615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51678769 - 2³ = 51678761 is a prime.

It is a super-2 number, since 2×51678769² = 5341390330710722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51678761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1123429 + ... + 1123474.

It is an arithmetic number, because the mean of its divisors is an integer number (13481424).

Almost surely, 2^51678769 is an apocalyptic number.

It is an amenable number.

51678769 is a deficient number, since it is larger than the sum of its proper divisors (2246927).

51678769 is a wasteful number, since it uses less digits than its factorization.

51678769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2246926.

The product of its digits is 635040, while the sum is 49.

The square root of 51678769 is about 7188.7946833944. The cubic root of 51678769 is about 372.4809389223.

The spelling of 51678769 in words is "fifty-one million, six hundred seventy-eight thousand, seven hundred sixty-nine".