51090228 has 72 divisors (see below), whose sum is σ = 152705280. Its totient is φ = 14091840.

The previous prime is 51090217. The next prime is 51090233. The reversal of 51090228 is 82209015.

It is a super-2 number, since 2×51090228² = 5220422794183968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3813 + ... + 10803.

Almost surely, 2^51090228 is an apocalyptic number.

51090228 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51090228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76352640).

51090228 is an abundant number, since it is smaller than the sum of its proper divisors (101615052).

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

51090228 is a wasteful number, since it uses less digits than its factorization.

51090228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7037 (or 7032 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 51090228 is about 7147.7428605120. The cubic root of 51090228 is about 371.0615436392.

The spelling of 51090228 in words is "fifty-one million, ninety thousand, two hundred twenty-eight".