51504530 has 32 divisors (see below), whose sum is σ = 115585920. Its totient is φ = 16053120.

The previous prime is 51504529. The next prime is 51504553. The reversal of 51504530 is 3540515.

It is a super-2 number, since 2×51504530² = 5305433221041800, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51504496 and 51504505.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32675 + ... + 34214.

It is an arithmetic number, because the mean of its divisors is an integer number (3612060).

Almost surely, 2^51504530 is an apocalyptic number.

51504530 is an abundant number, since it is smaller than the sum of its proper divisors (64081390).

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

51504530 is a wasteful number, since it uses less digits than its factorization.

51504530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66914.

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 51504530 is about 7176.6656603189. The cubic root of 51504530 is about 372.0618513951.

The spelling of 51504530 in words is "fifty-one million, five hundred four thousand, five hundred thirty".