51125778 has 24 divisors (see below), whose sum is σ = 120843216. Its totient is φ = 15492600.

The previous prime is 51125773. The next prime is 51125779. The reversal of 51125778 is 87752115.

It is a super-2 number, since 2×51125778² = 5227690352210568, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51125771) 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, 128908 + ... + 129303.

It is an arithmetic number, because the mean of its divisors is an integer number (5035134).

Almost surely, 2^51125778 is an apocalyptic number.

51125778 is an abundant number, since it is smaller than the sum of its proper divisors (69717438).

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

51125778 is a wasteful number, since it uses less digits than its factorization.

51125778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258230 (or 258227 counting only the distinct ones).

The product of its digits is 19600, while the sum is 36.

The square root of 51125778 is about 7150.2292270948. The cubic root of 51125778 is about 371.1475886617.

The spelling of 51125778 in words is "fifty-one million, one hundred twenty-five thousand, seven hundred seventy-eight".