51657478 has 16 divisors (see below), whose sum is σ = 78336000. Its totient is φ = 25547400.

The previous prime is 51657451. The next prime is 51657479. The reversal of 51657478 is 87475615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51657479) 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 7 ways as a sum of consecutive naturals, for example, 103273 + ... + 103771.

It is an arithmetic number, because the mean of its divisors is an integer number (4896000).

Almost surely, 2^51657478 is an apocalyptic number.

51657478 is a deficient number, since it is larger than the sum of its proper divisors (26678522).

51657478 is a wasteful number, since it uses less digits than its factorization.

51657478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 963.

The product of its digits is 235200, while the sum is 43.

The square root of 51657478 is about 7187.3136845417. The cubic root of 51657478 is about 372.4297794154.

The spelling of 51657478 in words is "fifty-one million, six hundred fifty-seven thousand, four hundred seventy-eight".