51696778 has 32 divisors (see below), whose sum is σ = 95477760. Its totient is φ = 20504880.

The previous prime is 51696769. The next prime is 51696797. The reversal of 51696778 is 87769615.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7393 + ... + 12571.

It is an arithmetic number, because the mean of its divisors is an integer number (2983680).

Almost surely, 2^51696778 is an apocalyptic number.

51696778 is a deficient number, since it is larger than the sum of its proper divisors (43780982).

51696778 is a wasteful number, since it uses less digits than its factorization.

51696778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5242.

The product of its digits is 635040, while the sum is 49.

The square root of 51696778 is about 7190.0471486632. The cubic root of 51696778 is about 372.5242012413.

The spelling of 51696778 in words is "fifty-one million, six hundred ninety-six thousand, seven hundred seventy-eight".