51649884 has 144 divisors (see below), whose sum is σ = 156549120. Its totient is φ = 14152320.

The previous prime is 51649877. The next prime is 51649889. The reversal of 51649884 is 48894615.

Its product of digits (276480) is a multiple of the sum of its prime factors (240).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51649889) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 406629 + ... + 406755.

Almost surely, 2^51649884 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 51649884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78274560).

51649884 is an abundant number, since it is smaller than the sum of its proper divisors (104899236).

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

51649884 is a wasteful number, since it uses less digits than its factorization.

51649884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240 (or 235 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 51649884 is about 7186.7853731693. The cubic root of 51649884 is about 372.4115286190.

The spelling of 51649884 in words is "fifty-one million, six hundred forty-nine thousand, eight hundred eighty-four".