61605287 has 4 divisors (see below), whose sum is σ = 62090496. Its totient is φ = 61120080.

The previous prime is 61605241. The next prime is 61605289. The reversal of 61605287 is 78250616.

61605287 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61605287 - 2⁶ = 61605223 is a prime.

It is a super-2 number, since 2×61605287² = 7590422772704738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61605289) 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 3 ways as a sum of consecutive naturals, for example, 242414 + ... + 242667.

It is an arithmetic number, because the mean of its divisors is an integer number (15522624).

Almost surely, 2^61605287 is an apocalyptic number.

61605287 is a deficient number, since it is larger than the sum of its proper divisors (485209).

61605287 is a wasteful number, since it uses less digits than its factorization.

61605287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485208.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 61605287 is about 7848.9035540004. The cubic root of 61605287 is about 394.9474629694.

The spelling of 61605287 in words is "sixty-one million, six hundred five thousand, two hundred eighty-seven".