51390260 has 12 divisors (see below), whose sum is σ = 107919588. Its totient is φ = 20556096.

The previous prime is 51390221. The next prime is 51390263. The reversal of 51390260 is 6209315.

It can be written as a sum of positive squares in 2 ways, for example, as 31427236 + 19963024 = 5606^2 + 4468^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51390263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1284737 + ... + 1284776.

It is an arithmetic number, because the mean of its divisors is an integer number (8993299).

Almost surely, 2^51390260 is an apocalyptic number.

It is an amenable number.

51390260 is an abundant number, since it is smaller than the sum of its proper divisors (56529328).

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

51390260 is a wasteful number, since it uses less digits than its factorization.

51390260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2569522 (or 2569520 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 51390260 is about 7168.7000216218. The cubic root of 51390260 is about 371.7864905756.

Adding to 51390260 its reverse (6209315), we get a palindrome (57599575).

The spelling of 51390260 in words is "fifty-one million, three hundred ninety thousand, two hundred sixty".