61989186 has 32 divisors (see below), whose sum is σ = 147852288. Its totient is φ = 16940880.

The previous prime is 61989173. The next prime is 61989199. The reversal of 61989186 is 68198916.

It is an interprime number because it is at equal distance from previous prime (61989173) and next prime (61989199).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31120 + ... + 33051.

It is an arithmetic number, because the mean of its divisors is an integer number (4620384).

Almost surely, 2^61989186 is an apocalyptic number.

61989186 is an abundant number, since it is smaller than the sum of its proper divisors (85863102).

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

61989186 is a wasteful number, since it uses less digits than its factorization.

61989186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64206.

The product of its digits is 186624, while the sum is 48.

The square root of 61989186 is about 7873.3211543795. The cubic root of 61989186 is about 395.7661485333.

The spelling of 61989186 in words is "sixty-one million, nine hundred eighty-nine thousand, one hundred eighty-six".