61437220 has 24 divisors (see below), whose sum is σ = 138943224. Its totient is φ = 22684416.

The previous prime is 61437197. The next prime is 61437221. The reversal of 61437220 is 2273416.

61437220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3189796 + 58247424 = 1786^2 + 7632^2 .

It is not an unprimeable number, because it can be changed into a prime (61437221) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 117889 + ... + 118408.

It is an arithmetic number, because the mean of its divisors is an integer number (5789301).

Almost surely, 2^61437220 is an apocalyptic number.

It is an amenable number.

61437220 is an abundant number, since it is smaller than the sum of its proper divisors (77506004).

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

61437220 is a wasteful number, since it uses less digits than its factorization.

61437220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236319 (or 236317 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 61437220 is about 7838.1898420490. The cubic root of 61437220 is about 394.5879803538.

The spelling of 61437220 in words is "sixty-one million, four hundred thirty-seven thousand, two hundred twenty".