51657198 has 8 divisors (see below), whose sum is σ = 103314408. Its totient is φ = 17219064.

The previous prime is 51657197. The next prime is 51657223. The reversal of 51657198 is 89175615.

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

51657198 is an admirable number.

It is a super-2 number, since 2×51657198² = 5336932210422408, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51657197) 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, 4304761 + ... + 4304772.

It is an arithmetic number, because the mean of its divisors is an integer number (12914301).

Almost surely, 2^51657198 is an apocalyptic number.

51657198 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51657198 is a wasteful number, since it uses less digits than its factorization.

51657198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8609538.

The product of its digits is 75600, while the sum is 42.

The square root of 51657198 is about 7187.2942057495. The cubic root of 51657198 is about 372.4291065182.

The spelling of 51657198 in words is "fifty-one million, six hundred fifty-seven thousand, one hundred ninety-eight".