38778689 has 4 divisors (see below), whose sum is σ = 38858160. Its totient is φ = 38699220.

The previous prime is 38778673. The next prime is 38778767. The reversal of 38778689 is 98687783.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 38778689 - 2⁴ = 38778673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38778629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38999 + ... + 39980.

It is an arithmetic number, because the mean of its divisors is an integer number (9714540).

Almost surely, 2^38778689 is an apocalyptic number.

It is an amenable number.

38778689 is a deficient number, since it is larger than the sum of its proper divisors (79471).

38778689 is an equidigital number, since it uses as much as digits as its factorization.

38778689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79470.

The product of its digits is 4064256, while the sum is 56.

The square root of 38778689 is about 6227.2537285709. The cubic root of 38778689 is about 338.4784635171.

The spelling of 38778689 in words is "thirty-eight million, seven hundred seventy-eight thousand, six hundred eighty-nine".