61678243 has 4 divisors (see below), whose sum is σ = 67285368. Its totient is φ = 56071120.

The previous prime is 61678229. The next prime is 61678291. The reversal of 61678243 is 34287616.

61678243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61678243 - 2⁹ = 61677731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61678343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2803546 + ... + 2803567.

It is an arithmetic number, because the mean of its divisors is an integer number (16821342).

Almost surely, 2^61678243 is an apocalyptic number.

61678243 is a deficient number, since it is larger than the sum of its proper divisors (5607125).

61678243 is a wasteful number, since it uses less digits than its factorization.

61678243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5607124.

The product of its digits is 48384, while the sum is 37.

The square root of 61678243 is about 7853.5497069796. The cubic root of 61678243 is about 395.1033068466.

The spelling of 61678243 in words is "sixty-one million, six hundred seventy-eight thousand, two hundred forty-three".