51065620 has 24 divisors (see below), whose sum is σ = 113546664. Its totient is φ = 19224576.

The previous prime is 51065611. The next prime is 51065629. The reversal of 51065620 is 2656015.

It is an interprime number because it is at equal distance from previous prime (51065611) and next prime (51065629).

It can be written as a sum of positive squares in 4 ways, for example, as 4334724 + 46730896 = 2082^2 + 6836^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51065629) 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 7 ways as a sum of consecutive naturals, for example, 74757 + ... + 75436.

It is an arithmetic number, because the mean of its divisors is an integer number (4731111).

Almost surely, 2^51065620 is an apocalyptic number.

It is an amenable number.

51065620 is an abundant number, since it is smaller than the sum of its proper divisors (62481044).

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

51065620 is a wasteful number, since it uses less digits than its factorization.

51065620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150219 (or 150217 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 51065620 is about 7146.0212706093. The cubic root of 51065620 is about 371.0019591927.

The spelling of 51065620 in words is "fifty-one million, sixty-five thousand, six hundred twenty".