51549380 has 24 divisors (see below), whose sum is σ = 108949848. Its totient is φ = 20487168.

The previous prime is 51549361. The next prime is 51549397. The reversal of 51549380 is 8394515.

It can be written as a sum of positive squares in 4 ways, for example, as 369664 + 51179716 = 608^2 + 7154^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51549380.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5069 + ... + 11348.

It is an arithmetic number, because the mean of its divisors is an integer number (4539577).

Almost surely, 2^51549380 is an apocalyptic number.

It is an amenable number.

51549380 is an abundant number, since it is smaller than the sum of its proper divisors (57400468).

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

51549380 is a wasteful number, since it uses less digits than its factorization.

51549380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16583 (or 16581 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 51549380 is about 7179.7896905132. The cubic root of 51549380 is about 372.1698168674.

The spelling of 51549380 in words is "fifty-one million, five hundred forty-nine thousand, three hundred eighty".