61380605 has 16 divisors (see below), whose sum is σ = 86534784. Its totient is φ = 41206080.

The previous prime is 61380581. The next prime is 61380611. The reversal of 61380605 is 50608316.

It is not a de Polignac number, because 61380605 - 2¹⁶ = 61315069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 42209 + ... + 43638.

It is an arithmetic number, because the mean of its divisors is an integer number (5408424).

Almost surely, 2^61380605 is an apocalyptic number.

61380605 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

61380605 is a deficient number, since it is larger than the sum of its proper divisors (25154179).

61380605 is a wasteful number, since it uses less digits than its factorization.

61380605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85876.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 61380605 is about 7834.5775253041. The cubic root of 61380605 is about 394.4667375411.

It can be divided in two parts, 613 and 80605, that added together give a palindrome (81218).

The spelling of 61380605 in words is "sixty-one million, three hundred eighty thousand, six hundred five".