51758690 has 8 divisors (see below), whose sum is σ = 93165660. Its totient is φ = 20703472.

The previous prime is 51758689. The next prime is 51758699. The reversal of 51758690 is 9685715.

It can be written as a sum of positive squares in 2 ways, for example, as 49547521 + 2211169 = 7039^2 + 1487^2 .

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

It is a super-2 number, since 2×51758690² = 5357923981032200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51758699) 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, 2587925 + ... + 2587944.

Almost surely, 2^51758690 is an apocalyptic number.

51758690 is a deficient number, since it is larger than the sum of its proper divisors (41406970).

51758690 is a wasteful number, since it uses less digits than its factorization.

51758690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5175876.

The product of its (nonzero) digits is 75600, while the sum is 41.

The square root of 51758690 is about 7194.3512563677. The cubic root of 51758690 is about 372.6728534290.

The spelling of 51758690 in words is "fifty-one million, seven hundred fifty-eight thousand, six hundred ninety".