61801216 has 36 divisors (see below), whose sum is σ = 125088712. Its totient is φ = 30468096.

The previous prime is 61801213. The next prime is 61801217. The reversal of 61801216 is 61210816.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (61801213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17035 + ... + 20341.

Almost surely, 2^61801216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61801216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62544356).

61801216 is an abundant number, since it is smaller than the sum of its proper divisors (63287496).

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

61801216 is an equidigital number, since it uses as much as digits as its factorization.

61801216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3396 (or 3382 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 61801216 is about 7861.3749433544. The cubic root of 61801216 is about 395.3657158780.

It can be divided in two parts, 6180 and 1216, that added together give a square (7396 = 86²).

The spelling of 61801216 in words is "sixty-one million, eight hundred one thousand, two hundred sixteen".