51080820 has 48 divisors (see below), whose sum is σ = 163459968. Its totient is φ = 11675520.

The previous prime is 51080819. The next prime is 51080833. The reversal of 51080820 is 2808015.

It is a congruent number.

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, 60391 + ... + 61230.

It is an arithmetic number, because the mean of its divisors is an integer number (3405416).

Almost surely, 2^51080820 is an apocalyptic number.

It is an amenable number.

51080820 is an abundant number, since it is smaller than the sum of its proper divisors (112379148).

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

51080820 is a wasteful number, since it uses less digits than its factorization.

51080820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121640 (or 121638 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 51080820 is about 7147.0847203598. The cubic root of 51080820 is about 371.0387658894.

Adding to 51080820 its reverse (2808015), we get a palindrome (53888835).

The spelling of 51080820 in words is "fifty-one million, eighty thousand, eight hundred twenty".