51563478 has 16 divisors (see below), whose sum is σ = 106454016. Its totient is φ = 16633320.

The previous prime is 51563471. The next prime is 51563497. The reversal of 51563478 is 87436515.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51563471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138426 + ... + 138797.

It is an arithmetic number, because the mean of its divisors is an integer number (6653376).

Almost surely, 2^51563478 is an apocalyptic number.

51563478 is an abundant number, since it is smaller than the sum of its proper divisors (54890538).

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

51563478 is a wasteful number, since it uses less digits than its factorization.

51563478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277259.

The product of its digits is 100800, while the sum is 39.

The square root of 51563478 is about 7180.7714070286. The cubic root of 51563478 is about 372.2037414387.

The spelling of 51563478 in words is "fifty-one million, five hundred sixty-three thousand, four hundred seventy-eight".