51284730 has 64 divisors (see below), whose sum is σ = 142092288. Its totient is φ = 11603520.

The previous prime is 51284729. The next prime is 51284771. The reversal of 51284730 is 3748215.

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

It is a Curzon 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, 20445 + ... + 22815.

It is an arithmetic number, because the mean of its divisors is an integer number (2220192).

Almost surely, 2^51284730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51284730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71046144).

51284730 is an abundant number, since it is smaller than the sum of its proper divisors (90807558).

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

51284730 is a wasteful number, since it uses less digits than its factorization.

51284730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2491.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 51284730 is about 7161.3357692542. The cubic root of 51284730 is about 371.5318280828.

The spelling of 51284730 in words is "fifty-one million, two hundred eighty-four thousand, seven hundred thirty".