61720106 has 20 divisors (see below), whose sum is σ = 108012162. Its totient is φ = 26449416.

The previous prime is 61720079. The next prime is 61720111. The reversal of 61720106 is 60102716.

It can be written as a sum of positive squares in only one way, i.e., 57684025 + 4036081 = 7595^2 + 2009^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1625 + ... + 11228.

Almost surely, 2^61720106 is an apocalyptic number.

61720106 is a deficient number, since it is larger than the sum of its proper divisors (46292056).

61720106 is an equidigital number, since it uses as much as digits as its factorization.

61720106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12883 (or 12862 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 61720106 is about 7856.2144828155. The cubic root of 61720106 is about 395.1926763888.

The spelling of 61720106 in words is "sixty-one million, seven hundred twenty thousand, one hundred six".