51881388 has 24 divisors (see below), whose sum is σ = 130369008. Its totient is φ = 15963456.

The previous prime is 51881387. The next prime is 51881413. The reversal of 51881388 is 88318815.

It is not an unprimeable number, because it can be changed into a prime (51881387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166131 + ... + 166442.

It is an arithmetic number, because the mean of its divisors is an integer number (5432042).

Almost surely, 2^51881388 is an apocalyptic number.

It is an amenable number.

51881388 is an abundant number, since it is smaller than the sum of its proper divisors (78487620).

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

51881388 is a wasteful number, since it uses less digits than its factorization.

51881388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332593 (or 332591 counting only the distinct ones).

The product of its digits is 61440, while the sum is 42.

The square root of 51881388 is about 7202.8735932265. The cubic root of 51881388 is about 372.9671043639.

The spelling of 51881388 in words is "fifty-one million, eight hundred eighty-one thousand, three hundred eighty-eight".