51238530 has 48 divisors (see below), whose sum is σ = 152253504. Its totient is φ = 11711520.

The previous prime is 51238529. The next prime is 51238541. The reversal of 51238530 is 3583215.

51238530 is a `hidden beast` number, since 5 + 123 + 8 + 530 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 51238494 and 51238503.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40036 + ... + 41295.

It is an arithmetic number, because the mean of its divisors is an integer number (3171948).

Almost surely, 2^51238530 is an apocalyptic number.

51238530 is an abundant number, since it is smaller than the sum of its proper divisors (101014974).

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

51238530 is a wasteful number, since it uses less digits than its factorization.

51238530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81351 (or 81348 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 51238530 is about 7158.1093872614. The cubic root of 51238530 is about 371.4202293844.

The spelling of 51238530 in words is "fifty-one million, two hundred thirty-eight thousand, five hundred thirty".