61623220 has 12 divisors (see below), whose sum is σ = 129408804. Its totient is φ = 24649280.

The previous prime is 61623217. The next prime is 61623229. The reversal of 61623220 is 2232616.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20304036 + 41319184 = 4506^2 + 6428^2 .

It is a junction number, because it is equal to n+sod(n) for n = 61623191 and 61623200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61623229) 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, 1540561 + ... + 1540600.

It is an arithmetic number, because the mean of its divisors is an integer number (10784067).

Almost surely, 2^61623220 is an apocalyptic number.

It is an amenable number.

61623220 is an abundant number, since it is smaller than the sum of its proper divisors (67785584).

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

61623220 is a wasteful number, since it uses less digits than its factorization.

61623220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3081170 (or 3081168 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 61623220 is about 7850.0458597387. The cubic root of 61623220 is about 394.9857816812.

Adding to 61623220 its reverse (2232616), we get a palindrome (63855836).

The spelling of 61623220 in words is "sixty-one million, six hundred twenty-three thousand, two hundred twenty".