61216722 has 80 divisors (see below), whose sum is σ = 161113920. Its totient is φ = 17006112.

The previous prime is 61216717. The next prime is 61216739. The reversal of 61216722 is 22761216.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 39 ways as a sum of consecutive naturals, for example, 41229 + ... + 42687.

It is an arithmetic number, because the mean of its divisors is an integer number (2013924).

Almost surely, 2^61216722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61216722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80556960).

61216722 is an abundant number, since it is smaller than the sum of its proper divisors (99897198).

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

61216722 is a wasteful number, since it uses less digits than its factorization.

61216722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1517 (or 1508 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 61216722 is about 7824.1115789590. Note that the first 3 decimals coincide. The cubic root of 61216722 is about 394.1153561235.

Adding to 61216722 its reverse (22761216), we get a palindrome (83977938).

The spelling of 61216722 in words is "sixty-one million, two hundred sixteen thousand, seven hundred twenty-two".