51765630 has 64 divisors (see below), whose sum is σ = 144695808. Its totient is φ = 11606400.

The previous prime is 51765613. The next prime is 51765641. The reversal of 51765630 is 3656715.

It is a junction number, because it is equal to n+sod(n) for n = 51765591 and 51765600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8805 + ... + 13455.

It is an arithmetic number, because the mean of its divisors is an integer number (2260872).

Almost surely, 2^51765630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51765630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72347904).

51765630 is an abundant number, since it is smaller than the sum of its proper divisors (92930178).

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

51765630 is a wasteful number, since it uses less digits than its factorization.

51765630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4721.

The product of its (nonzero) digits is 18900, while the sum is 33.

The square root of 51765630 is about 7194.8335630506. The cubic root of 51765630 is about 372.6895091443.

The spelling of 51765630 in words is "fifty-one million, seven hundred sixty-five thousand, six hundred thirty".