61690305 has 16 divisors (see below), whose sum is σ = 99665280. Its totient is φ = 32581248.

The previous prime is 61690303. The next prime is 61690313. The reversal of 61690305 is 50309616.

It is a happy number.

61690305 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61690305 - 2¹ = 61690303 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (61690303) 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 15 ways as a sum of consecutive naturals, for example, 18420 + ... + 21509.

It is an arithmetic number, because the mean of its divisors is an integer number (6229080).

Almost surely, 2^61690305 is an apocalyptic number.

It is an amenable number.

61690305 is a deficient number, since it is larger than the sum of its proper divisors (37974975).

61690305 is a wasteful number, since it uses less digits than its factorization.

61690305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40040.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 61690305 is about 7854.3176024401. The cubic root of 61690305 is about 395.1290610684.

The spelling of 61690305 in words is "sixty-one million, six hundred ninety thousand, three hundred five".