51569690 has 8 divisors (see below), whose sum is σ = 92825460. Its totient is φ = 20627872.

The previous prime is 51569681. The next prime is 51569701. The reversal of 51569690 is 9696515.

It can be written as a sum of positive squares in 2 ways, for example, as 51308569 + 261121 = 7163^2 + 511^2 .

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

It is a super-2 number, since 2×51569690² = 5318865853392200, which contains 22 as substring.

It is a Curzon number.

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 3 ways as a sum of consecutive naturals, for example, 2578475 + ... + 2578494.

Almost surely, 2^51569690 is an apocalyptic number.

51569690 is a deficient number, since it is larger than the sum of its proper divisors (41255770).

51569690 is a wasteful number, since it uses less digits than its factorization.

51569690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5156976.

The product of its (nonzero) digits is 72900, while the sum is 41.

The square root of 51569690 is about 7181.2039380594. The cubic root of 51569690 is about 372.2186876557.

The spelling of 51569690 in words is "fifty-one million, five hundred sixty-nine thousand, six hundred ninety".