61272220 has 24 divisors (see below), whose sum is σ = 128823408. Its totient is φ = 24480000.

The previous prime is 61272217. The next prime is 61272221. The reversal of 61272220 is 2227216.

It is a junction number, because it is equal to n+sod(n) for n = 61272191 and 61272200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61272221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26095 + ... + 28345.

It is an arithmetic number, because the mean of its divisors is an integer number (5367642).

Almost surely, 2^61272220 is an apocalyptic number.

It is an amenable number.

61272220 is an abundant number, since it is smaller than the sum of its proper divisors (67551188).

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

61272220 is a wasteful number, since it uses less digits than its factorization.

61272220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3621 (or 3619 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 61272220 is about 7827.6573762525. The cubic root of 61272220 is about 394.2344194930.

Adding to 61272220 its reverse (2227216), we get a palindrome (63499436).

The spelling of 61272220 in words is "sixty-one million, two hundred seventy-two thousand, two hundred twenty".