61864386 has 8 divisors (see below), whose sum is σ = 123728784. Its totient is φ = 20621460.

The previous prime is 61864379. The next prime is 61864403. The reversal of 61864386 is 68346816.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

61864386 is an admirable number.

It is a super-3 number, since 3×61864386³ (a number of 24 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5155360 + ... + 5155371.

It is an arithmetic number, because the mean of its divisors is an integer number (15466098).

Almost surely, 2^61864386 is an apocalyptic number.

61864386 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

61864386 is a wasteful number, since it uses less digits than its factorization.

61864386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10310736.

The product of its digits is 165888, while the sum is 42.

The square root of 61864386 is about 7865.3916622124. The cubic root of 61864386 is about 395.5003774550.

The spelling of 61864386 in words is "sixty-one million, eight hundred sixty-four thousand, three hundred eighty-six".