61980005 has 8 divisors (see below), whose sum is σ = 76775424. Its totient is φ = 47984400.

The previous prime is 61979959. The next prime is 61980019. The reversal of 61980005 is 50008916.

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

It is not a de Polignac number, because 61980005 - 2¹⁴ = 61963621 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61980005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199781 + ... + 200090.

It is an arithmetic number, because the mean of its divisors is an integer number (9596928).

Almost surely, 2^61980005 is an apocalyptic number.

It is an amenable number.

61980005 is a deficient number, since it is larger than the sum of its proper divisors (14795419).

61980005 is a wasteful number, since it uses less digits than its factorization.

61980005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399907.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 61980005 is about 7872.7380878574. The cubic root of 61980005 is about 395.7466090586.

The spelling of 61980005 in words is "sixty-one million, nine hundred eighty thousand, five".