51305890 has 16 divisors (see below), whose sum is σ = 97211520. Its totient is φ = 19442160.

The previous prime is 51305861. The next prime is 51305897. The reversal of 51305890 is 9850315.

It is not an unprimeable number, because it can be changed into a prime (51305897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134826 + ... + 135205.

It is an arithmetic number, because the mean of its divisors is an integer number (6075720).

Almost surely, 2^51305890 is an apocalyptic number.

51305890 is a deficient number, since it is larger than the sum of its proper divisors (45905630).

51305890 is a wasteful number, since it uses less digits than its factorization.

51305890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270057.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 51305890 is about 7162.8129949064. The cubic root of 51305890 is about 371.5829188753.

The spelling of 51305890 in words is "fifty-one million, three hundred five thousand, eight hundred ninety".