61865287 has 4 divisors (see below), whose sum is σ = 67489416. Its totient is φ = 56241160.

The previous prime is 61865267. The next prime is 61865291. The reversal of 61865287 is 78256816.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61865287 is a prime.

It is a super-3 number, since 3×61865287³ (a number of 24 digits) contains 333 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 (61865267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2812048 + ... + 2812069.

It is an arithmetic number, because the mean of its divisors is an integer number (16872354).

Almost surely, 2^61865287 is an apocalyptic number.

61865287 is a deficient number, since it is larger than the sum of its proper divisors (5624129).

61865287 is a wasteful number, since it uses less digits than its factorization.

61865287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5624128.

The product of its digits is 161280, while the sum is 43.

The square root of 61865287 is about 7865.4489382361. The cubic root of 61865287 is about 395.5022974833.

The spelling of 61865287 in words is "sixty-one million, eight hundred sixty-five thousand, two hundred eighty-seven".