51404775 has 48 divisors (see below), whose sum is σ = 88640160.
Its totient is φ = 26265600.
The previous prime is 51404767. The next prime is 51404807. The reversal of 51404775 is 57740415.
It is not a de Polignac number, because 51404775 - 23 = 51404767 is a prime.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 224361 + ... + 224589.
It is an arithmetic number, because the mean of its divisors is an integer number (1846670).
Almost surely, 251404775 is an apocalyptic number.
51404775 is a deficient number, since it is larger than the sum of its proper divisors (37235385).
51404775 is a wasteful number, since it uses less digits than its factorization.
51404775 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 356 (or 351 counting only the distinct ones).
The product of its (nonzero) digits is 19600, while the sum is 33.
The square root of 51404775 is about 7169.7123373257.
The cubic root of 51404775 is about 371.8214905472.
It can be divided in two parts, 51 and 404775, that multiplied together give a triangular number (20643525 = T6425).
The spelling of 51404775 in words is "fifty-one million, four hundred four thousand, seven hundred seventy-five".