51866798 has 4 divisors (see below), whose sum is σ = 77800200. Its totient is φ = 25933398.

The previous prime is 51866791. The next prime is 51866809. The reversal of 51866798 is 89766815.

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 (51866791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12966698 + ... + 12966701.

It is an arithmetic number, because the mean of its divisors is an integer number (19450050).

Almost surely, 2^51866798 is an apocalyptic number.

51866798 is a deficient number, since it is larger than the sum of its proper divisors (25933402).

51866798 is a wasteful number, since it uses less digits than its factorization.

51866798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25933401.

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

The square root of 51866798 is about 7201.8607317831. The cubic root of 51866798 is about 372.9321393509.

The spelling of 51866798 in words is "fifty-one million, eight hundred sixty-six thousand, seven hundred ninety-eight".