61186986 has 72 divisors (see below), whose sum is σ = 155494404. Its totient is φ = 17337600.

The previous prime is 61186933. The next prime is 61186991. The reversal of 61186986 is 68968116.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 42653961 + 18533025 = 6531^2 + 4305^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 152386 + ... + 152786.

Almost surely, 2^61186986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61186986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77747202).

61186986 is an abundant number, since it is smaller than the sum of its proper divisors (94307418).

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

61186986 is a wasteful number, since it uses less digits than its factorization.

61186986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596 (or 586 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 61186986 is about 7822.2110684895. The cubic root of 61186986 is about 394.0515319922.

The spelling of 61186986 in words is "sixty-one million, one hundred eighty-six thousand, nine hundred eighty-six".