61864979 has 8 divisors (see below), whose sum is σ = 68344320. Its totient is φ = 55528200.

The previous prime is 61864967. The next prime is 61864997. The reversal of 61864979 is 97946816.

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

It is a cyclic number.

It is not a de Polignac number, because 61864979 - 2¹⁶ = 61799443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61864909) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 34727 + ... + 36464.

It is an arithmetic number, because the mean of its divisors is an integer number (8543040).

Almost surely, 2^61864979 is an apocalyptic number.

61864979 is a deficient number, since it is larger than the sum of its proper divisors (6479341).

61864979 is a wasteful number, since it uses less digits than its factorization.

61864979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71281.

The product of its digits is 653184, while the sum is 50.

The square root of 61864979 is about 7865.4293589098. The cubic root of 61864979 is about 395.5016411383.

The spelling of 61864979 in words is "sixty-one million, eight hundred sixty-four thousand, nine hundred seventy-nine".