61720198 has 8 divisors (see below), whose sum is σ = 92751192. Its totient is φ = 30803136.

The previous prime is 61720187. The next prime is 61720213. The reversal of 61720198 is 89102716.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27115 + ... + 29302.

It is an arithmetic number, because the mean of its divisors is an integer number (11593899).

Almost surely, 2^61720198 is an apocalyptic number.

61720198 is a deficient number, since it is larger than the sum of its proper divisors (31030994).

61720198 is a wasteful number, since it uses less digits than its factorization.

61720198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56966.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 61720198 is about 7856.2203380506. The cubic root of 61720198 is about 395.1928727468.

The spelling of 61720198 in words is "sixty-one million, seven hundred twenty thousand, one hundred ninety-eight".