61005636 has 42 divisors (see below), whose sum is σ = 160074222. Its totient is φ = 20334240.

The previous prime is 61005631. The next prime is 61005641. The reversal of 61005636 is 63650016.

It is an interprime number because it is at equal distance from previous prime (61005631) and next prime (61005641).

It can be written as a sum of positive squares in only one way, i.e., 56340036 + 4665600 = 7506^2 + 2160^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (61005631) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 7545 + ... + 13376.

It is an arithmetic number, because the mean of its divisors is an integer number (3811291).

Almost surely, 2^61005636 is an apocalyptic number.

It is an amenable number.

61005636 is an abundant number, since it is smaller than the sum of its proper divisors (99068586).

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

61005636 is a wasteful number, since it uses less digits than its factorization.

61005636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20943 (or 20926 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 61005636 is about 7810.6104755006. The cubic root of 61005636 is about 393.6618414877.

The spelling of 61005636 in words is "sixty-one million, five thousand, six hundred thirty-six".