61609810 has 32 divisors (see below), whose sum is σ = 115505712. Its totient is φ = 23639040.

The previous prime is 61609781. The next prime is 61609811. The reversal of 61609810 is 1890616.

It is a happy number.

61609810 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 8 ways, for example, as 45118089 + 16491721 = 6717^2 + 4061^2 .

It is a super-2 number, since 2×61609810² = 7591537376472200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61609811) 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 15 ways as a sum of consecutive naturals, for example, 25870 + ... + 28150.

Almost surely, 2^61609810 is an apocalyptic number.

61609810 is a deficient number, since it is larger than the sum of its proper divisors (53895902).

61609810 is a wasteful number, since it uses less digits than its factorization.

61609810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2398.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 61609810 is about 7849.1916781284. The cubic root of 61609810 is about 394.9571282851.

The spelling of 61609810 in words is "sixty-one million, six hundred nine thousand, eight hundred ten".