51678869 has 8 divisors (see below), whose sum is σ = 57441312. Its totient is φ = 46093840.

The previous prime is 51678857. The next prime is 51678883. The reversal of 51678869 is 96887615.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51678869 - 2⁴ = 51678853 is a prime.

It is a super-2 number, since 2×51678869² = 5341411002238322, 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 (51678889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43739 + ... + 44904.

It is an arithmetic number, because the mean of its divisors is an integer number (7180164).

Almost surely, 2^51678869 is an apocalyptic number.

It is an amenable number.

51678869 is a deficient number, since it is larger than the sum of its proper divisors (5762443).

51678869 is a wasteful number, since it uses less digits than its factorization.

51678869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88707.

The product of its digits is 725760, while the sum is 50.

The square root of 51678869 is about 7188.8016386600. The cubic root of 51678869 is about 372.4811791761.

The spelling of 51678869 in words is "fifty-one million, six hundred seventy-eight thousand, eight hundred sixty-nine".