51250890 has 16 divisors (see below), whose sum is σ = 123002208. Its totient is φ = 13666896.

The previous prime is 51250889. The next prime is 51250897. The reversal of 51250890 is 9805215.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 1708363 = 51250890 / (5 + 1 + 2 + 5 + 0 + 8 + 9 + 0).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51250897) 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, 854152 + ... + 854211.

It is an arithmetic number, because the mean of its divisors is an integer number (7687638).

Almost surely, 2^51250890 is an apocalyptic number.

51250890 is an abundant number, since it is smaller than the sum of its proper divisors (71751318).

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

51250890 is a wasteful number, since it uses less digits than its factorization.

51250890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1708373.

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 51250890 is about 7158.9726916646. The cubic root of 51250890 is about 371.4500922301.

The spelling of 51250890 in words is "fifty-one million, two hundred fifty thousand, eight hundred ninety".