51968690 has 16 divisors (see below), whose sum is σ = 93680280. Its totient is φ = 20757120.

The previous prime is 51968647. The next prime is 51968701. The reversal of 51968690 is 9686915.

It can be written as a sum of positive squares in 4 ways, for example, as 24730729 + 27237961 = 4973^2 + 5219^2 .

It is a super-2 number, since 2×51968690² = 5401489480632200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4196 + ... + 11024.

Almost surely, 2^51968690 is an apocalyptic number.

51968690 is a deficient number, since it is larger than the sum of its proper divisors (41711590).

51968690 is a wasteful number, since it uses less digits than its factorization.

51968690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7597.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 51968690 is about 7208.9312661448. The cubic root of 51968690 is about 373.1761872282.

The spelling of 51968690 in words is "fifty-one million, nine hundred sixty-eight thousand, six hundred ninety".