61788156 has 12 divisors (see below), whose sum is σ = 144172392. Its totient is φ = 20596048.

The previous prime is 61788131. The next prime is 61788169. The reversal of 61788156 is 65188716.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2574495 + ... + 2574518.

It is an arithmetic number, because the mean of its divisors is an integer number (12014366).

Almost surely, 2^61788156 is an apocalyptic number.

It is an amenable number.

61788156 is an abundant number, since it is smaller than the sum of its proper divisors (82384236).

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

61788156 is a wasteful number, since it uses less digits than its factorization.

61788156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5149020 (or 5149018 counting only the distinct ones).

The product of its digits is 80640, while the sum is 42.

The square root of 61788156 is about 7860.5442559660. The cubic root of 61788156 is about 395.3378639988.

The spelling of 61788156 in words is "sixty-one million, seven hundred eighty-eight thousand, one hundred fifty-six".