51522380 has 48 divisors (see below), whose sum is σ = 133170240. Its totient is φ = 16305408.

The previous prime is 51522371. The next prime is 51522391. The reversal of 51522380 is 8322515.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12335 + ... + 15974.

It is an arithmetic number, because the mean of its divisors is an integer number (2774380).

Almost surely, 2^51522380 is an apocalyptic number.

It is an amenable number.

51522380 is an abundant number, since it is smaller than the sum of its proper divisors (81647860).

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

51522380 is a wasteful number, since it uses less digits than its factorization.

51522380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28338 (or 28336 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 51522380 is about 7177.9091663241. The cubic root of 51522380 is about 372.1048284366.

Adding to 51522380 its reverse (8322515), we get a palindrome (59844895).

The spelling of 51522380 in words is "fifty-one million, five hundred twenty-two thousand, three hundred eighty".