61770216 has 32 divisors (see below), whose sum is σ = 162554400. Its totient is φ = 19506240.

The previous prime is 61770199. The next prime is 61770217. The reversal of 61770216 is 61207716.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (61770217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67275 + ... + 68186.

It is an arithmetic number, because the mean of its divisors is an integer number (5079825).

Almost surely, 2^61770216 is an apocalyptic number.

It is an amenable number.

61770216 is an abundant number, since it is smaller than the sum of its proper divisors (100784184).

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

61770216 is a wasteful number, since it uses less digits than its factorization.

61770216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135489 (or 135485 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 61770216 is about 7859.4030307651. The cubic root of 61770216 is about 395.2995985864.

Subtracting from 61770216 its reverse (61207716), we obtain a square (562500 = 750²).

The spelling of 61770216 in words is "sixty-one million, seven hundred seventy thousand, two hundred sixteen".