61428389 has 16 divisors (see below), whose sum is σ = 69037056. Its totient is φ = 54178800.

The previous prime is 61428371. The next prime is 61428401. The reversal of 61428389 is 98382416.

61428389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61428389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61428359) 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 15 ways as a sum of consecutive naturals, for example, 67274 + ... + 68180.

It is an arithmetic number, because the mean of its divisors is an integer number (4314816).

Almost surely, 2^61428389 is an apocalyptic number.

It is an amenable number.

61428389 is a deficient number, since it is larger than the sum of its proper divisors (7608667).

61428389 is a wasteful number, since it uses less digits than its factorization.

61428389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096.

The product of its digits is 82944, while the sum is 41.

The square root of 61428389 is about 7837.6264902074. The cubic root of 61428389 is about 394.5690733925.

The spelling of 61428389 in words is "sixty-one million, four hundred twenty-eight thousand, three hundred eighty-nine".