51366784 has 32 divisors (see below), whose sum is σ = 116953200. Its totient is φ = 22013952.

The previous prime is 51366781. The next prime is 51366787. The reversal of 51366784 is 48766315.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51366781) and next prime (51366787).

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51366781) 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, 27769 + ... + 29560.

Almost surely, 2^51366784 is an apocalyptic number.

It is an amenable number.

51366784 is an abundant number, since it is smaller than the sum of its proper divisors (65586416).

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

51366784 is an equidigital number, since it uses as much as digits as its factorization.

51366784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57350 (or 57338 counting only the distinct ones).

The product of its digits is 120960, while the sum is 40.

The square root of 51366784 is about 7167.0624386843. The cubic root of 51366784 is about 371.7298690223.

The spelling of 51366784 in words is "fifty-one million, three hundred sixty-six thousand, seven hundred eighty-four".