61020306 has 12 divisors (see below), whose sum is σ = 132210702. Its totient is φ = 20340096.

The previous prime is 61020299. The next prime is 61020319. The reversal of 61020306 is 60302016.

It is a happy number.

61020306 is a `hidden beast` number, since 610 + 20 + 30 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 47734281 + 13286025 = 6909^2 + 3645^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 3390017 = 61020306 / (6 + 1 + 0 + 2 + 0 + 3 + 0 + 6).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1694991 + ... + 1695026.

Almost surely, 2^61020306 is an apocalyptic number.

61020306 is an abundant number, since it is smaller than the sum of its proper divisors (71190396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61020306 is a wasteful number, since it uses less digits than its factorization.

61020306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3390025 (or 3390022 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 61020306 is about 7811.5495261824. The cubic root of 61020306 is about 393.6933935254.

The spelling of 61020306 in words is "sixty-one million, twenty thousand, three hundred six".