61864143 has 16 divisors (see below), whose sum is σ = 92078976. Its totient is φ = 36620640.

The previous prime is 61864109. The next prime is 61864147. The reversal of 61864143 is 34146816.

It is not a de Polignac number, because 61864143 - 2⁸ = 61863887 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61864147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20380 + ... + 23217.

It is an arithmetic number, because the mean of its divisors is an integer number (5754936).

Almost surely, 2^61864143 is an apocalyptic number.

61864143 is a deficient number, since it is larger than the sum of its proper divisors (30214833).

61864143 is a wasteful number, since it uses less digits than its factorization.

61864143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43654.

The product of its digits is 13824, while the sum is 33.

The square root of 61864143 is about 7865.3762147783. The cubic root of 61864143 is about 395.4998596196.

The spelling of 61864143 in words is "sixty-one million, eight hundred sixty-four thousand, one hundred forty-three".