61318220 has 36 divisors (see below), whose sum is σ = 131063520. Its totient is φ = 24093888.

The previous prime is 61318219. The next prime is 61318249. The reversal of 61318220 is 2281316.

61318220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 311162 + ... + 311358.

Almost surely, 2^61318220 is an apocalyptic number.

It is an amenable number.

61318220 is an abundant number, since it is smaller than the sum of its proper divisors (69745300).

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

61318220 is a wasteful number, since it uses less digits than its factorization.

61318220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482 (or 283 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 61318220 is about 7830.5951242546. The cubic root of 61318220 is about 394.3330517224. Note that the first 3 decimals are identical.

Adding to 61318220 its reverse (2281316), we get a palindrome (63599536).

The spelling of 61318220 in words is "sixty-one million, three hundred eighteen thousand, two hundred twenty".