51420890 has 8 divisors (see below), whose sum is σ = 92557620. Its totient is φ = 20568352.

The previous prime is 51420881. The next prime is 51420899. The reversal of 51420890 is 9802415.

51420890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51420881) and next prime (51420899).

It can be written as a sum of positive squares in 2 ways, for example, as 51136801 + 284089 = 7151^2 + 533^2 .

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 (51420899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2571035 + ... + 2571054.

Almost surely, 2^51420890 is an apocalyptic number.

51420890 is a deficient number, since it is larger than the sum of its proper divisors (41136730).

51420890 is a wasteful number, since it uses less digits than its factorization.

51420890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5142096.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 51420890 is about 7170.8360739875. The cubic root of 51420890 is about 371.8603408764.

The spelling of 51420890 in words is "fifty-one million, four hundred twenty thousand, eight hundred ninety".