51578730 has 192 divisors, whose sum is σ = 167731200. Its totient is φ = 10730880.

The previous prime is 51578729. The next prime is 51578741. The reversal of 51578730 is 3787515.

51578730 is a `hidden beast` number, since 51 + 578 + 7 + 30 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 371001 + ... + 371139.

It is an arithmetic number, because the mean of its divisors is an integer number (873600).

Almost surely, 2^51578730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51578730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83865600).

51578730 is an abundant number, since it is smaller than the sum of its proper divisors (116152470).

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

51578730 is a wasteful number, since it uses less digits than its factorization.

51578730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209 (or 206 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 36.

The square root of 51578730 is about 7181.8333313994. The cubic root of 51578730 is about 372.2404359626.

The spelling of 51578730 in words is "fifty-one million, five hundred seventy-eight thousand, seven hundred thirty".