51806628 has 36 divisors (see below), whose sum is σ = 135808400. Its totient is φ = 17268552.

The previous prime is 51806627. The next prime is 51806653. The reversal of 51806628 is 82660815.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 51806592 and 51806601.

It is not an unprimeable number, because it can be changed into a prime (51806627) 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, 25678 + ... + 27621.

Almost surely, 2^51806628 is an apocalyptic number.

It is an amenable number.

51806628 is an abundant number, since it is smaller than the sum of its proper divisors (84001772).

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

51806628 is a wasteful number, since it uses less digits than its factorization.

51806628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53318 (or 53304 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 51806628 is about 7197.6821269072. The cubic root of 51806628 is about 372.7878723022.

The spelling of 51806628 in words is "fifty-one million, eight hundred six thousand, six hundred twenty-eight".