51445642 has 8 divisors (see below), whose sum is σ = 77364036. Its totient is φ = 25657632.

The previous prime is 51445637. The next prime is 51445643. The reversal of 51445642 is 24654415.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 44742721 + 6702921 = 6689^2 + 2589^2 .

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

It is not an unprimeable number, because it can be changed into a prime (51445643) 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, 31603 + ... + 33190.

Almost surely, 2^51445642 is an apocalyptic number.

51445642 is a deficient number, since it is larger than the sum of its proper divisors (25918394).

51445642 is a wasteful number, since it uses less digits than its factorization.

51445642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65192.

The product of its digits is 19200, while the sum is 31.

The square root of 51445642 is about 7172.5617459873. The cubic root of 51445642 is about 371.9199976339.

The spelling of 51445642 in words is "fifty-one million, four hundred forty-five thousand, six hundred forty-two".