51698408 has 8 divisors (see below), whose sum is σ = 96934530. Its totient is φ = 25849200.

The previous prime is 51698407. The next prime is 51698419. The reversal of 51698408 is 80489615.

51698408 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 51523684 + 174724 = 7178^2 + 418^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (51698401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3231143 + ... + 3231158.

Almost surely, 2^51698408 is an apocalyptic number.

It is an amenable number.

51698408 is a deficient number, since it is larger than the sum of its proper divisors (45236122).

51698408 is a wasteful number, since it uses less digits than its factorization.

51698408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6462307 (or 6462303 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 51698408 is about 7190.1604989040. The cubic root of 51698408 is about 372.5281164309.

The spelling of 51698408 in words is "fifty-one million, six hundred ninety-eight thousand, four hundred eight".