51506228 has 6 divisors (see below), whose sum is σ = 90135906. Its totient is φ = 25753112.

The previous prime is 51506227. The next prime is 51506239. The reversal of 51506228 is 82260515.

It can be written as a sum of positive squares in only one way, i.e., 51437584 + 68644 = 7172^2 + 262^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51506228.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51506227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6438275 + ... + 6438282.

It is an arithmetic number, because the mean of its divisors is an integer number (15022651).

Almost surely, 2^51506228 is an apocalyptic number.

It is an amenable number.

51506228 is a deficient number, since it is larger than the sum of its proper divisors (38629678).

51506228 is a wasteful number, since it uses less digits than its factorization.

51506228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12876561 (or 12876559 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 51506228 is about 7176.7839594069. The cubic root of 51506228 is about 372.0659400587.

The spelling of 51506228 in words is "fifty-one million, five hundred six thousand, two hundred twenty-eight".