51500690 has 8 divisors (see below), whose sum is σ = 92701260. Its totient is φ = 20600272.

The previous prime is 51500681. The next prime is 51500693. The reversal of 51500690 is 9600515.

It can be written as a sum of positive squares in 2 ways, for example, as 48427681 + 3073009 = 6959^2 + 1753^2 .

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

It is a super-3 number, since 3×51500690³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (51500693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2575025 + ... + 2575044.

Almost surely, 2^51500690 is an apocalyptic number.

51500690 is a deficient number, since it is larger than the sum of its proper divisors (41200570).

51500690 is a wasteful number, since it uses less digits than its factorization.

51500690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5150076.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 51500690 is about 7176.3981216206. The cubic root of 51500690 is about 372.0526046162.

The spelling of 51500690 in words is "fifty-one million, five hundred thousand, six hundred ninety".