61630156 has 48 divisors (see below), whose sum is σ = 130281984. Its totient is φ = 24938496.

The previous prime is 61630109. The next prime is 61630157. The reversal of 61630156 is 65103616.

It is a super-2 number, since 2×61630156² = 7596552257168672, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (61630157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52876 + ... + 54028.

It is an arithmetic number, because the mean of its divisors is an integer number (2714208).

Almost surely, 2^61630156 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 61630156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65140992).

61630156 is an abundant number, since it is smaller than the sum of its proper divisors (68651828).

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

61630156 is a wasteful number, since it uses less digits than its factorization.

61630156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1270 (or 1268 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 61630156 is about 7850.4876281668. The cubic root of 61630156 is about 395.0006003302. Note that the first 3 decimals are identical.

The spelling of 61630156 in words is "sixty-one million, six hundred thirty thousand, one hundred fifty-six".