61504287 has 32 divisors (see below), whose sum is σ = 90994176. Its totient is φ = 36720000.

The previous prime is 61504271. The next prime is 61504297. The reversal of 61504287 is 78240516.

It is not a de Polignac number, because 61504287 - 2⁴ = 61504271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61504207) 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 31 ways as a sum of consecutive naturals, for example, 244912 + ... + 245162.

It is an arithmetic number, because the mean of its divisors is an integer number (2843568).

Almost surely, 2^61504287 is an apocalyptic number.

61504287 is a deficient number, since it is larger than the sum of its proper divisors (29489889).

61504287 is a wasteful number, since it uses less digits than its factorization.

61504287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 61504287 is about 7842.4668950529. The cubic root of 61504287 is about 394.7315101137.

The spelling of 61504287 in words is "sixty-one million, five hundred four thousand, two hundred eighty-seven".