61689156 has 12 divisors (see below), whose sum is σ = 143941392. Its totient is φ = 20563048.

The previous prime is 61689139. The next prime is 61689157. The reversal of 61689156 is 65198616.

It is a happy number.

61689156 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (61689157) 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 3 ways as a sum of consecutive naturals, for example, 2570370 + ... + 2570393.

It is an arithmetic number, because the mean of its divisors is an integer number (11995116).

Almost surely, 2^61689156 is an apocalyptic number.

It is an amenable number.

61689156 is an abundant number, since it is smaller than the sum of its proper divisors (82252236).

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

61689156 is a wasteful number, since it uses less digits than its factorization.

61689156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5140770 (or 5140768 counting only the distinct ones).

The product of its digits is 77760, while the sum is 42.

The square root of 61689156 is about 7854.2444576165. The cubic root of 61689156 is about 395.1266079217.

The spelling of 61689156 in words is "sixty-one million, six hundred eighty-nine thousand, one hundred fifty-six".