51440722 has 8 divisors (see below), whose sum is σ = 79821900. Its totient is φ = 24833424.

The previous prime is 51440713. The next prime is 51440729. The reversal of 51440722 is 22704415.

It can be written as a sum of positive squares in 2 ways, for example, as 51279921 + 160801 = 7161^2 + 401^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×51440722² = 5292295759762568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51440729) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 443397 + ... + 443512.

Almost surely, 2^51440722 is an apocalyptic number.

51440722 is a deficient number, since it is larger than the sum of its proper divisors (28381178).

51440722 is a wasteful number, since it uses less digits than its factorization.

51440722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886940.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 51440722 is about 7172.2187640925. The cubic root of 51440722 is about 371.9081410758.

The spelling of 51440722 in words is "fifty-one million, four hundred forty thousand, seven hundred twenty-two".