51361578 has 24 divisors (see below), whose sum is σ = 111758400. Its totient is φ = 17047464.

The previous prime is 51361577. The next prime is 51361589. The reversal of 51361578 is 87516315.

51361578 is a `hidden beast` number, since 51 + 36 + 1 + 578 = 666.

It is not an unprimeable number, because it can be changed into a prime (51361577) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1668 + ... + 10271.

It is an arithmetic number, because the mean of its divisors is an integer number (4656600).

Almost surely, 2^51361578 is an apocalyptic number.

51361578 is an abundant number, since it is smaller than the sum of its proper divisors (60396822).

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

51361578 is a wasteful number, since it uses less digits than its factorization.

51361578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12186 (or 12183 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 51361578 is about 7166.6992402361. The cubic root of 51361578 is about 371.7173103808.

The spelling of 51361578 in words is "fifty-one million, three hundred sixty-one thousand, five hundred seventy-eight".