51304390 has 16 divisors (see below), whose sum is σ = 92488032. Its totient is φ = 20490624.

The previous prime is 51304381. The next prime is 51304397. The reversal of 51304390 is 9340315.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51304397) 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, 3742 + ... + 10798.

It is an arithmetic number, because the mean of its divisors is an integer number (5780502).

Almost surely, 2^51304390 is an apocalyptic number.

51304390 is a deficient number, since it is larger than the sum of its proper divisors (41183642).

51304390 is a wasteful number, since it uses less digits than its factorization.

51304390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7791.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 51304390 is about 7162.7082866748. The cubic root of 51304390 is about 371.5792975899.

The spelling of 51304390 in words is "fifty-one million, three hundred four thousand, three hundred ninety".