61428287 has 2 divisors, whose sum is σ = 61428288. Its totient is φ = 61428286.

The previous prime is 61428253. The next prime is 61428299. The reversal of 61428287 is 78282416.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61428287 - 2⁶ = 61428223 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61428287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61428247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30714143 + 30714144.

It is an arithmetic number, because the mean of its divisors is an integer number (30714144).

Almost surely, 2^61428287 is an apocalyptic number.

61428287 is a deficient number, since it is larger than the sum of its proper divisors (1).

61428287 is an equidigital number, since it uses as much as digits as its factorization.

61428287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43008, while the sum is 38.

The square root of 61428287 is about 7837.6199831326. The cubic root of 61428287 is about 394.5688550023.

The spelling of 61428287 in words is "sixty-one million, four hundred twenty-eight thousand, two hundred eighty-seven".