51669144 has 64 divisors (see below), whose sum is σ = 146889600. Its totient is φ = 16819488.

The previous prime is 51669119. The next prime is 51669169. The reversal of 51669144 is 44196615.

It is an interprime number because it is at equal distance from previous prime (51669119) and next prime (51669169).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 51669099 and 51669108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6507 + ... + 12069.

It is an arithmetic number, because the mean of its divisors is an integer number (2295150).

Almost surely, 2^51669144 is an apocalyptic number.

51669144 is a gapful number since it is divisible by the number (54) 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 51669144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73444800).

51669144 is an abundant number, since it is smaller than the sum of its proper divisors (95220456).

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

51669144 is a wasteful number, since it uses less digits than its factorization.

51669144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5621 (or 5611 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 51669144 is about 7188.1252075906. The cubic root of 51669144 is about 372.4578130384.

The spelling of 51669144 in words is "fifty-one million, six hundred sixty-nine thousand, one hundred forty-four".