61866216 has 48 divisors (see below), whose sum is σ = 167918400. Its totient is φ = 20577312.

The previous prime is 61866209. The next prime is 61866227. The reversal of 61866216 is 61266816.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59025 + ... + 60063.

It is an arithmetic number, because the mean of its divisors is an integer number (3498300).

Almost surely, 2^61866216 is an apocalyptic number.

It is an amenable number.

61866216 is an abundant number, since it is smaller than the sum of its proper divisors (106052184).

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

61866216 is a wasteful number, since it uses less digits than its factorization.

61866216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1878 (or 1871 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 61866216 is about 7865.5079937662. The cubic root of 61866216 is about 395.5042771600.

The spelling of 61866216 in words is "sixty-one million, eight hundred sixty-six thousand, two hundred sixteen".