51645228 has 12 divisors (see below), whose sum is σ = 120505560. Its totient is φ = 17215072.

The previous prime is 51645227. The next prime is 51645233. The reversal of 51645228 is 82254615.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (51645221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2151873 + ... + 2151896.

It is an arithmetic number, because the mean of its divisors is an integer number (10042130).

Almost surely, 2^51645228 is an apocalyptic number.

It is an amenable number.

51645228 is an abundant number, since it is smaller than the sum of its proper divisors (68860332).

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

51645228 is a wasteful number, since it uses less digits than its factorization.

51645228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4303776 (or 4303774 counting only the distinct ones).

The product of its digits is 19200, while the sum is 33.

The square root of 51645228 is about 7186.4614380097. The cubic root of 51645228 is about 372.4003378860.

The spelling of 51645228 in words is "fifty-one million, six hundred forty-five thousand, two hundred twenty-eight".