51081678 has 40 divisors (see below), whose sum is σ = 117138648. Its totient is φ = 16628976.

The previous prime is 51081661. The next prime is 51081691. The reversal of 51081678 is 87618015.

51081678 is a `hidden beast` number, since 510 + 81 + 67 + 8 = 666.

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 in 19 ways as a sum of consecutive naturals, for example, 3300 + ... + 10632.

Almost surely, 2^51081678 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51081678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58569324).

51081678 is an abundant number, since it is smaller than the sum of its proper divisors (66056970).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51081678 is a wasteful number, since it uses less digits than its factorization.

51081678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7390 (or 7381 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 36.

The square root of 51081678 is about 7147.1447445816. The cubic root of 51081678 is about 371.0408433128.

It can be divided in two parts, 5108 and 1678, that added together give a triangular number (6786 = T₁₁₆).

The spelling of 51081678 in words is "fifty-one million, eighty-one thousand, six hundred seventy-eight".