61817216 has 16 divisors (see below), whose sum is σ = 123151740. Its totient is φ = 30908544.

The previous prime is 61817207. The next prime is 61817237. The reversal of 61817216 is 61271816.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 241346 + ... + 241601.

Almost surely, 2^61817216 is an apocalyptic number.

It is an amenable number.

61817216 is a deficient number, since it is larger than the sum of its proper divisors (61334524).

61817216 is an equidigital number, since it uses as much as digits as its factorization.

61817216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482961 (or 482949 counting only the distinct ones).

The product of its digits is 4032, while the sum is 32.

The square root of 61817216 is about 7862.3925111889. The cubic root of 61817216 is about 395.3998322812.

The spelling of 61817216 in words is "sixty-one million, eight hundred seventeen thousand, two hundred sixteen".