61530156 has 54 divisors (see below), whose sum is σ = 158537652. Its totient is φ = 20121360.

The previous prime is 61530127. The next prime is 61530179. The reversal of 61530156 is 65103516.

It is a happy number.

61530156 is a `hidden beast` number, since 615 + 30 + 15 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 125071 + ... + 125561.

Almost surely, 2^61530156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61530156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79268826).

61530156 is an abundant number, since it is smaller than the sum of its proper divisors (97007496).

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

61530156 is a wasteful number, since it uses less digits than its factorization.

61530156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619 (or 555 counting only the distinct ones).

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

The square root of 61530156 is about 7844.1160113808. The cubic root of 61530156 is about 394.7868443493.

The spelling of 61530156 in words is "sixty-one million, five hundred thirty thousand, one hundred fifty-six".