51448690 has 16 divisors (see below), whose sum is σ = 94355928. Its totient is φ = 20190976.

The previous prime is 51448687. The next prime is 51448729. The reversal of 51448690 is 9684415.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 50851161 + 597529 = 7131^2 + 773^2 .

It is a super-2 number, since 2×51448690² = 5293935405432200, which contains 22 as substring.

It is an unprimeable number.

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, 48007 + ... + 49066.

Almost surely, 2^51448690 is an apocalyptic number.

51448690 is a deficient number, since it is larger than the sum of its proper divisors (42907238).

51448690 is a wasteful number, since it uses less digits than its factorization.

51448690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97133.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 51448690 is about 7172.7742192265. The cubic root of 51448690 is about 371.9273425370.

The spelling of 51448690 in words is "fifty-one million, four hundred forty-eight thousand, six hundred ninety".