61867879 has 4 divisors (see below), whose sum is σ = 65507184. Its totient is φ = 58228576.

The previous prime is 61867873. The next prime is 61867889. The reversal of 61867879 is 97876816.

61867879 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 61867879 - 2¹⁹ = 61343591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61867873) 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, 1819627 + ... + 1819660.

It is an arithmetic number, because the mean of its divisors is an integer number (16376796).

Almost surely, 2^61867879 is an apocalyptic number.

61867879 is a deficient number, since it is larger than the sum of its proper divisors (3639305).

61867879 is a wasteful number, since it uses less digits than its factorization.

61867879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3639304.

The product of its digits is 1016064, while the sum is 52.

The square root of 61867879 is about 7865.6137077789. The cubic root of 61867879 is about 395.5078209235.

The spelling of 61867879 in words is "sixty-one million, eight hundred sixty-seven thousand, eight hundred seventy-nine".