67778889 has 8 divisors (see below), whose sum is σ = 90871872. Its totient is φ = 44935920.

The previous prime is 67778849. The next prime is 67778903. The reversal of 67778889 is 98887776.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 67778889 - 2¹⁵ = 67746121 is a prime.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (67778819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61869 + ... + 62954.

It is an arithmetic number, because the mean of its divisors is an integer number (11358984).

Almost surely, 2^67778889 is an apocalyptic number.

It is an amenable number.

67778889 is a deficient number, since it is larger than the sum of its proper divisors (23092983).

67778889 is a wasteful number, since it uses less digits than its factorization.

67778889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125007.

The product of its digits is 9483264, while the sum is 60.

The square root of 67778889 is about 8232.7935113180. The cubic root of 67778889 is about 407.7226284220.

The spelling of 67778889 in words is "sixty-seven million, seven hundred seventy-eight thousand, eight hundred eighty-nine".