51777878 has 8 divisors (see below), whose sum is σ = 78730968. Its totient is φ = 25534224.

The previous prime is 51777877. The next prime is 51777883. The reversal of 51777878 is 87877715.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51777871) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 177176 + ... + 177467.

It is an arithmetic number, because the mean of its divisors is an integer number (9841371).

Almost surely, 2^51777878 is an apocalyptic number.

51777878 is a deficient number, since it is larger than the sum of its proper divisors (26953090).

51777878 is a wasteful number, since it uses less digits than its factorization.

51777878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354718.

The product of its digits is 768320, while the sum is 50.

The square root of 51777878 is about 7195.6846790281. The cubic root of 51777878 is about 372.7189002103.

It can be divided in two parts, 51 and 777878, that multiplied together give a triangular number (39671778 = T₈₉₀₇).

The spelling of 51777878 in words is "fifty-one million, seven hundred seventy-seven thousand, eight hundred seventy-eight".