51807630 has 128 divisors (see below), whose sum is σ = 150958080. Its totient is φ = 11128320.

The previous prime is 51807629. The next prime is 51807671. The reversal of 51807630 is 3670815.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 286140 + ... + 286320.

It is an arithmetic number, because the mean of its divisors is an integer number (1179360).

Almost surely, 2^51807630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51807630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75479040).

51807630 is an abundant number, since it is smaller than the sum of its proper divisors (99150450).

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

51807630 is a wasteful number, since it uses less digits than its factorization.

51807630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 51807630 is about 7197.7517323120. The cubic root of 51807630 is about 372.7902756693.

The spelling of 51807630 in words is "fifty-one million, eight hundred seven thousand, six hundred thirty".