61303220 has 24 divisors (see below), whose sum is σ = 140440608. Its totient is φ = 22292000.

The previous prime is 61303141. The next prime is 61303237. The reversal of 61303220 is 2230316.

61303220 = T₁₉₁₁ + T₁₉₁₂ + ... + T₁₉₄₃.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139106 + ... + 139545.

It is an arithmetic number, because the mean of its divisors is an integer number (5851692).

Almost surely, 2^61303220 is an apocalyptic number.

It is an amenable number.

61303220 is an abundant number, since it is smaller than the sum of its proper divisors (79137388).

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

61303220 is a wasteful number, since it uses less digits than its factorization.

61303220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278671 (or 278669 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 61303220 is about 7829.6372840637. The cubic root of 61303220 is about 394.3008944606.

Adding to 61303220 its reverse (2230316), we get a palindrome (63533536).

The spelling of 61303220 in words is "sixty-one million, three hundred three thousand, two hundred twenty".