61305216 has 64 divisors (see below), whose sum is σ = 186113280. Its totient is φ = 17515008.

The previous prime is 61305187. The next prime is 61305221. The reversal of 61305216 is 61250316.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8716 + ... + 14091.

It is an arithmetic number, because the mean of its divisors is an integer number (2908020).

Almost surely, 2^61305216 is an apocalyptic number.

It is an amenable number.

61305216 is an abundant number, since it is smaller than the sum of its proper divisors (124808064).

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

61305216 is a wasteful number, since it uses less digits than its factorization.

61305216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22831 (or 22819 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 61305216 is about 7829.7647474238. The cubic root of 61305216 is about 394.3051738228.

The spelling of 61305216 in words is "sixty-one million, three hundred five thousand, two hundred sixteen".