51778764 has 30 divisors (see below), whose sum is σ = 135360764. Its totient is φ = 17259480.

The previous prime is 51778729. The next prime is 51778801. The reversal of 51778764 is 46787715.

51778764 is a `hidden beast` number, since 517 + 78 + 7 + 64 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 79582 + ... + 80229.

Almost surely, 2^51778764 is an apocalyptic number.

51778764 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

51778764 is an abundant number, since it is smaller than the sum of its proper divisors (83582000).

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

51778764 is a wasteful number, since it uses less digits than its factorization.

51778764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159827 (or 159816 counting only the distinct ones).

The product of its digits is 329280, while the sum is 45.

The square root of 51778764 is about 7195.7462434413. The cubic root of 51778764 is about 372.7210261315.

The spelling of 51778764 in words is "fifty-one million, seven hundred seventy-eight thousand, seven hundred sixty-four".