51806078 has 4 divisors (see below), whose sum is σ = 77709120. Its totient is φ = 25903038.

The previous prime is 51806077. The next prime is 51806101. The reversal of 51806078 is 87060815.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51806077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12951518 + ... + 12951521.

It is an arithmetic number, because the mean of its divisors is an integer number (19427280).

Almost surely, 2^51806078 is an apocalyptic number.

51806078 is a deficient number, since it is larger than the sum of its proper divisors (25903042).

51806078 is a wasteful number, since it uses less digits than its factorization.

51806078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25903041.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 51806078 is about 7197.6439200616. The cubic root of 51806078 is about 372.7865530755.

The spelling of 51806078 in words is "fifty-one million, eight hundred six thousand, seventy-eight".