51384630 has 64 divisors (see below), whose sum is σ = 137438208. Its totient is φ = 12188160.

The previous prime is 51384611. The next prime is 51384637. The reversal of 51384630 is 3648315.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51384637) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13854 + ... + 17166.

It is an arithmetic number, because the mean of its divisors is an integer number (2147472).

Almost surely, 2^51384630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51384630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68719104).

51384630 is an abundant number, since it is smaller than the sum of its proper divisors (86053578).

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

51384630 is a wasteful number, since it uses less digits than its factorization.

51384630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3381.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 51384630 is about 7168.3073315811. The cubic root of 51384630 is about 371.7729132013.

The spelling of 51384630 in words is "fifty-one million, three hundred eighty-four thousand, six hundred thirty".