67778897 has 4 divisors (see below), whose sum is σ = 68100336. Its totient is φ = 67457460.

The previous prime is 67778849. The next prime is 67778903. The reversal of 67778897 is 79887776.

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 a de Polignac number, because none of the positive numbers 2^k-67778897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67778807) 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, 160403 + ... + 160824.

It is an arithmetic number, because the mean of its divisors is an integer number (17025084).

Almost surely, 2^67778897 is an apocalyptic number.

It is an amenable number.

67778897 is a deficient number, since it is larger than the sum of its proper divisors (321439).

67778897 is a wasteful number, since it uses less digits than its factorization.

67778897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321438.

The product of its digits is 8297856, while the sum is 59.

The square root of 67778897 is about 8232.7939971798. The cubic root of 67778897 is about 407.7226444633.

The spelling of 67778897 in words is "sixty-seven million, seven hundred seventy-eight thousand, eight hundred ninety-seven".