51261804 has 36 divisors (see below), whose sum is σ = 141359400. Its totient is φ = 15533760.

The previous prime is 51261797. The next prime is 51261823. The reversal of 51261804 is 40816215.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64329 + ... + 65120.

It is an arithmetic number, because the mean of its divisors is an integer number (3926650).

Almost surely, 2^51261804 is an apocalyptic number.

It is an amenable number.

51261804 is an abundant number, since it is smaller than the sum of its proper divisors (90097596).

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

51261804 is a wasteful number, since it uses less digits than its factorization.

51261804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129470 (or 129465 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 51261804 is about 7159.7349112939. The cubic root of 51261804 is about 371.4764574215.

The spelling of 51261804 in words is "fifty-one million, two hundred sixty-one thousand, eight hundred four".