51425320 has 16 divisors (see below), whose sum is σ = 115707060. Its totient is φ = 20570112.

The previous prime is 51425299. The next prime is 51425321. The reversal of 51425320 is 2352415.

It can be written as a sum of positive squares in 2 ways, for example, as 51236964 + 188356 = 7158^2 + 434^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51425291 and 51425300.

It is not an unprimeable number, because it can be changed into a prime (51425321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 642777 + ... + 642856.

Almost surely, 2^51425320 is an apocalyptic number.

It is an amenable number.

51425320 is an abundant number, since it is smaller than the sum of its proper divisors (64281740).

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

51425320 is a wasteful number, since it uses less digits than its factorization.

51425320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285644 (or 1285640 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 51425320 is about 7171.1449573970. The cubic root of 51425320 is about 371.8710193769.

Adding to 51425320 its reverse (2352415), we get a palindrome (53777735).

The spelling of 51425320 in words is "fifty-one million, four hundred twenty-five thousand, three hundred twenty".