51947678 has 4 divisors (see below), whose sum is σ = 77921520. Its totient is φ = 25973838.

The previous prime is 51947669. The next prime is 51947681. The reversal of 51947678 is 87674915.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87674915 = 5 ⋅17534983.

It is a super-2 number, since 2×51947678² = 5397122499183368, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12986918 + ... + 12986921.

It is an arithmetic number, because the mean of its divisors is an integer number (19480380).

Almost surely, 2^51947678 is an apocalyptic number.

51947678 is a deficient number, since it is larger than the sum of its proper divisors (25973842).

51947678 is a wasteful number, since it uses less digits than its factorization.

51947678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25973841.

The product of its digits is 423360, while the sum is 47.

The square root of 51947678 is about 7207.4737599245. The cubic root of 51947678 is about 373.1258862035.

It can be divided in two parts, 51947 and 678, that added together give a palindrome (52625).

The spelling of 51947678 in words is "fifty-one million, nine hundred forty-seven thousand, six hundred seventy-eight".