61155630 has 48 divisors (see below), whose sum is σ = 168362064. Its totient is φ = 15348480.

The previous prime is 61155617. The next prime is 61155631. The reversal of 61155630 is 3655116.

It is a happy number.

61155630 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×61155630² = 7480022161393800, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 61155594 and 61155603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61155631) 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 23 ways as a sum of consecutive naturals, for example, 18456 + ... + 21515.

It is an arithmetic number, because the mean of its divisors is an integer number (3507543).

Almost surely, 2^61155630 is an apocalyptic number.

61155630 is an abundant number, since it is smaller than the sum of its proper divisors (107206434).

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

61155630 is a wasteful number, since it uses less digits than its factorization.

61155630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40001 (or 39998 counting only the distinct ones).

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

The square root of 61155630 is about 7820.2065190121. The cubic root of 61155630 is about 393.9842083564.

The spelling of 61155630 in words is "sixty-one million, one hundred fifty-five thousand, six hundred thirty".