51890688 has 60 divisors (see below), whose sum is σ = 149773338. Its totient is φ = 17295360.

The previous prime is 51890659. The next prime is 51890693. The reversal of 51890688 is 88609815.

It can be written as a sum of positive squares in only one way, i.e., 28387584 + 23503104 = 5328^2 + 4848^2 .

It is a super-2 number, since 2×51890688² = 5385287002226688, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1023 + ... + 10238.

Almost surely, 2^51890688 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 51890688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74886669).

51890688 is an abundant number, since it is smaller than the sum of its proper divisors (97882650).

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

51890688 is a wasteful number, since it uses less digits than its factorization.

51890688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11285 (or 11266 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 51890688 is about 7203.5191399760. The cubic root of 51890688 is about 372.9893884429.

The spelling of 51890688 in words is "fifty-one million, eight hundred ninety thousand, six hundred eighty-eight".