51778200 has 48 divisors (see below), whose sum is σ = 160514280. Its totient is φ = 13807360.

The previous prime is 51778189. The next prime is 51778201. The reversal of 51778200 is 287715.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51778201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42549 + ... + 43748.

Almost surely, 2^51778200 is an apocalyptic number.

51778200 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51778200 is an abundant number, since it is smaller than the sum of its proper divisors (108736080).

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

51778200 is a wasteful number, since it uses less digits than its factorization.

51778200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86316 (or 86307 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 51778200 is about 7195.7070535146. The cubic root of 51778200 is about 372.7196728391.

The spelling of 51778200 in words is "fifty-one million, seven hundred seventy-eight thousand, two hundred".