51780286 has 4 divisors (see below), whose sum is σ = 77670432. Its totient is φ = 25890142.

The previous prime is 51780271. The next prime is 51780343. The reversal of 51780286 is 68208715.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68208715 = 5 ⋅13641743.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12945070 + ... + 12945073.

It is an arithmetic number, because the mean of its divisors is an integer number (19417608).

Almost surely, 2^51780286 is an apocalyptic number.

51780286 is a deficient number, since it is larger than the sum of its proper divisors (25890146).

51780286 is a wasteful number, since it uses less digits than its factorization.

51780286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25890145.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 51780286 is about 7195.8519995898. The cubic root of 51780286 is about 372.7246780524.

The spelling of 51780286 in words is "fifty-one million, seven hundred eighty thousand, two hundred eighty-six".