51881628 has 48 divisors (see below), whose sum is σ = 128011520. Its totient is φ = 16308864.

The previous prime is 51881623. The next prime is 51881653. The reversal of 51881628 is 82618815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51881623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71001 + ... + 71727.

Almost surely, 2^51881628 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 51881628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64005760).

51881628 is an abundant number, since it is smaller than the sum of its proper divisors (76129892).

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

51881628 is a wasteful number, since it uses less digits than its factorization.

51881628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066 (or 1064 counting only the distinct ones).

The product of its digits is 30720, while the sum is 39.

The square root of 51881628 is about 7202.8902532247. The cubic root of 51881628 is about 372.9676794704.

The spelling of 51881628 in words is "fifty-one million, eight hundred eighty-one thousand, six hundred twenty-eight".