61136220 has 24 divisors (see below), whose sum is σ = 171181584. Its totient is φ = 16302976.

The previous prime is 61136219. The next prime is 61136261. The reversal of 61136220 is 2263116.

It is a happy number.

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, 509409 + ... + 509528.

It is an arithmetic number, because the mean of its divisors is an integer number (7132566).

Almost surely, 2^61136220 is an apocalyptic number.

61136220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61136220 is an abundant number, since it is smaller than the sum of its proper divisors (110045364).

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

61136220 is a wasteful number, since it uses less digits than its factorization.

61136220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018949 (or 1018947 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 61136220 is about 7818.9654047067. The cubic root of 61136220 is about 393.9425221280.

Adding to 61136220 its reverse (2263116), we get a palindrome (63399336).

The spelling of 61136220 in words is "sixty-one million, one hundred thirty-six thousand, two hundred twenty".