51582220 has 12 divisors (see below), whose sum is σ = 108322704. Its totient is φ = 20632880.

The previous prime is 51582203. The next prime is 51582221. The reversal of 51582220 is 2228515.

It is not an unprimeable number, because it can be changed into a prime (51582221) 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, 1289536 + ... + 1289575.

It is an arithmetic number, because the mean of its divisors is an integer number (9026892).

Almost surely, 2^51582220 is an apocalyptic number.

It is an amenable number.

51582220 is an abundant number, since it is smaller than the sum of its proper divisors (56740484).

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

51582220 is a wasteful number, since it uses less digits than its factorization.

51582220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2579120 (or 2579118 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 51582220 is about 7182.0763014605. The cubic root of 51582220 is about 372.2488314764.

The spelling of 51582220 in words is "fifty-one million, five hundred eighty-two thousand, two hundred twenty".