51380778 has 8 divisors (see below), whose sum is σ = 102761568. Its totient is φ = 17126924.

The previous prime is 51380737. The next prime is 51380789. The reversal of 51380778 is 87708315.

It is a sphenic number, since it is the product of 3 distinct primes.

51380778 is an admirable number.

It is a super-3 number, since 3×51380778³ (a number of 24 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4281726 + ... + 4281737.

It is an arithmetic number, because the mean of its divisors is an integer number (12845196).

Almost surely, 2^51380778 is an apocalyptic number.

51380778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

51380778 is a wasteful number, since it uses less digits than its factorization.

51380778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8563468.

The product of its (nonzero) digits is 47040, while the sum is 39.

The square root of 51380778 is about 7168.0386438690. The cubic root of 51380778 is about 371.7636231014.

The spelling of 51380778 in words is "fifty-one million, three hundred eighty thousand, seven hundred seventy-eight".