51387805 has 16 divisors (see below), whose sum is σ = 70729344. Its totient is φ = 35110080.

The previous prime is 51387769. The next prime is 51387811. The reversal of 51387805 is 50878315.

It is not a de Polignac number, because 51387805 - 2⁹ = 51387293 is a prime.

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, 7750 + ... + 12760.

It is an arithmetic number, because the mean of its divisors is an integer number (4420584).

Almost surely, 2^51387805 is an apocalyptic number.

It is an amenable number.

51387805 is a deficient number, since it is larger than the sum of its proper divisors (19341539).

51387805 is a wasteful number, since it uses less digits than its factorization.

51387805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5316.

The product of its (nonzero) digits is 33600, while the sum is 37.

The square root of 51387805 is about 7168.5287890892. The cubic root of 51387805 is about 371.7805701907.

The spelling of 51387805 in words is "fifty-one million, three hundred eighty-seven thousand, eight hundred five".