61845290 has 32 divisors (see below), whose sum is σ = 120382416. Its totient is φ = 22740480.

The previous prime is 61845271. The next prime is 61845293. The reversal of 61845290 is 9254816.

It can be written as a sum of positive squares in 8 ways, for example, as 16834609 + 45010681 = 4103^2 + 6709^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 61845290.

It is not an unprimeable number, because it can be changed into a prime (61845293) 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 15 ways as a sum of consecutive naturals, for example, 35684 + ... + 37376.

Almost surely, 2^61845290 is an apocalyptic number.

61845290 is a deficient number, since it is larger than the sum of its proper divisors (58537126).

61845290 is a wasteful number, since it uses less digits than its factorization.

61845290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1994.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 61845290 is about 7864.1776429580. The cubic root of 61845290 is about 395.4596795516.

The spelling of 61845290 in words is "sixty-one million, eight hundred forty-five thousand, two hundred ninety".