51449890 has 8 divisors (see below), whose sum is σ = 92609820. Its totient is φ = 20579952.

The previous prime is 51449843. The next prime is 51449911. The reversal of 51449890 is 9894415.

It can be written as a sum of positive squares in 2 ways, for example, as 44315649 + 7134241 = 6657^2 + 2671^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2572485 + ... + 2572504.

Almost surely, 2^51449890 is an apocalyptic number.

51449890 is a deficient number, since it is larger than the sum of its proper divisors (41159930).

51449890 is a wasteful number, since it uses less digits than its factorization.

51449890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5144996.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 51449890 is about 7172.8578683813. The cubic root of 51449890 is about 371.9302341515.

The spelling of 51449890 in words is "fifty-one million, four hundred forty-nine thousand, eight hundred ninety".