51780465 has 80 divisors (see below), whose sum is σ = 103498560. Its totient is φ = 24554880.

The previous prime is 51780409. The next prime is 51780473. The reversal of 51780465 is 56408715.

51780465 is a `hidden beast` number, since 517 + 80 + 4 + 65 = 666.

51780465 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51780465 - 2⁶ = 51780401 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 262747 + ... + 262943.

It is an arithmetic number, because the mean of its divisors is an integer number (1293732).

Almost surely, 2^51780465 is an apocalyptic number.

51780465 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51780465 is a deficient number, since it is larger than the sum of its proper divisors (51718095).

51780465 is a wasteful number, since it uses less digits than its factorization.

51780465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284 (or 275 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 51780465 is about 7195.8644373001. The cubic root of 51780465 is about 372.7251075443.

The spelling of 51780465 in words is "fifty-one million, seven hundred eighty thousand, four hundred sixty-five".