51784787 has 4 divisors (see below), whose sum is σ = 53455296. Its totient is φ = 50114280.

The previous prime is 51784751. The next prime is 51784819. The reversal of 51784787 is 78748715.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78748715 = 5 ⋅15749743.

It is a cyclic number.

It is not a de Polignac number, because 51784787 - 2¹⁶ = 51719251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51784727) 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, 835208 + ... + 835269.

It is an arithmetic number, because the mean of its divisors is an integer number (13363824).

Almost surely, 2^51784787 is an apocalyptic number.

51784787 is a deficient number, since it is larger than the sum of its proper divisors (1670509).

51784787 is a wasteful number, since it uses less digits than its factorization.

51784787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1670508.

The product of its digits is 439040, while the sum is 47.

The square root of 51784787 is about 7196.1647424166. The cubic root of 51784787 is about 372.7354774337.

The spelling of 51784787 in words is "fifty-one million, seven hundred eighty-four thousand, seven hundred eighty-seven".