51505930 has 32 divisors (see below), whose sum is σ = 107961984. Its totient is φ = 17324736.

The previous prime is 51505921. The next prime is 51505967. The reversal of 51505930 is 3950515.

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, 3232 + ... + 10651.

It is an arithmetic number, because the mean of its divisors is an integer number (3373812).

Almost surely, 2^51505930 is an apocalyptic number.

51505930 is an abundant number, since it is smaller than the sum of its proper divisors (56456054).

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

51505930 is a wasteful number, since it uses less digits than its factorization.

51505930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13950.

The product of its (nonzero) digits is 3375, while the sum is 28.

The square root of 51505930 is about 7176.7631979884. The cubic root of 51505930 is about 372.0652225023.

The spelling of 51505930 in words is "fifty-one million, five hundred five thousand, nine hundred thirty".