61305156 has 72 divisors (see below), whose sum is σ = 170352000. Its totient is φ = 18434880.

The previous prime is 61305149. The next prime is 61305169. The reversal of 61305156 is 65150316.

It is a happy number.

61305156 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 58485 + ... + 59523.

It is an arithmetic number, because the mean of its divisors is an integer number (2366000).

Almost surely, 2^61305156 is an apocalyptic number.

61305156 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61305156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85176000).

61305156 is an abundant number, since it is smaller than the sum of its proper divisors (109046844).

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

61305156 is a wasteful number, since it uses less digits than its factorization.

61305156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1209 (or 1204 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 61305156 is about 7829.7609158901. The cubic root of 61305156 is about 394.3050451860.

The spelling of 61305156 in words is "sixty-one million, three hundred five thousand, one hundred fifty-six".