51969408 has 128 divisors (see below), whose sum is σ = 154224000. Its totient is φ = 15409152.

The previous prime is 51969367. The next prime is 51969431. The reversal of 51969408 is 80496915.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 51969408.

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, 123823 + ... + 124241.

It is an arithmetic number, because the mean of its divisors is an integer number (1204875).

Almost surely, 2^51969408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51969408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77112000).

51969408 is an abundant number, since it is smaller than the sum of its proper divisors (102254592).

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

51969408 is a wasteful number, since it uses less digits than its factorization.

51969408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472 (or 460 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 51969408 is about 7208.9810653101. The cubic root of 51969408 is about 373.1779058224.

The spelling of 51969408 in words is "fifty-one million, nine hundred sixty-nine thousand, four hundred eight".