61428890 has 16 divisors (see below), whose sum is σ = 110690280. Its totient is φ = 24545280.

The previous prime is 61428889. The next prime is 61428901. The reversal of 61428890 is 9882416.

61428890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 42393121 + 19035769 = 6511^2 + 4363^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 8570 + ... + 14010.

Almost surely, 2^61428890 is an apocalyptic number.

61428890 is a deficient number, since it is larger than the sum of its proper divisors (49261390).

61428890 is a wasteful number, since it uses less digits than its factorization.

61428890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6577.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 61428890 is about 7837.6584513488. The cubic root of 61428890 is about 394.5701460701.

The spelling of 61428890 in words is "sixty-one million, four hundred twenty-eight thousand, eight hundred ninety".