61719998 has 16 divisors (see below), whose sum is σ = 94296960. Its totient is φ = 30291096.

The previous prime is 61719991. The next prime is 61720019. The reversal of 61719998 is 89991716.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61719991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47465 + ... + 48747.

It is an arithmetic number, because the mean of its divisors is an integer number (5893560).

Almost surely, 2^61719998 is an apocalyptic number.

61719998 is a deficient number, since it is larger than the sum of its proper divisors (32576962).

61719998 is a wasteful number, since it uses less digits than its factorization.

61719998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1711.

The product of its digits is 244944, while the sum is 50.

The square root of 61719998 is about 7856.2076092731. The cubic root of 61719998 is about 395.1924458813.

The spelling of 61719998 in words is "sixty-one million, seven hundred nineteen thousand, nine hundred ninety-eight".