51222270 has 32 divisors (see below), whose sum is σ = 134110080. Its totient is φ = 12417440.

The previous prime is 51222253. The next prime is 51222289. The reversal of 51222270 is 7222215.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77280 + ... + 77939.

It is an arithmetic number, because the mean of its divisors is an integer number (4190940).

Almost surely, 2^51222270 is an apocalyptic number.

51222270 is an abundant number, since it is smaller than the sum of its proper divisors (82887810).

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

51222270 is a wasteful number, since it uses less digits than its factorization.

51222270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155240.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 51222270 is about 7156.9735223766. The cubic root of 51222270 is about 371.3809364806.

Adding to 51222270 its reverse (7222215), we get a palindrome (58444485).

The spelling of 51222270 in words is "fifty-one million, two hundred twenty-two thousand, two hundred seventy".