51669400 has 48 divisors (see below), whose sum is σ = 121811400. Its totient is φ = 20378880.

The previous prime is 51669383. The next prime is 51669421. The reversal of 51669400 is 496615.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 12831 + ... + 16369.

Almost surely, 2^51669400 is an apocalyptic number.

51669400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51669400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60905700).

51669400 is an abundant number, since it is smaller than the sum of its proper divisors (70142000).

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

51669400 is a wasteful number, since it uses less digits than its factorization.

51669400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3628 (or 3619 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 51669400 is about 7188.1430147153. The cubic root of 51669400 is about 372.4584281640.

The spelling of 51669400 in words is "fifty-one million, six hundred sixty-nine thousand, four hundred".