69778321 has 4 divisors (see below), whose sum is σ = 72184500. Its totient is φ = 67372144.

The previous prime is 69778309. The next prime is 69778363. The reversal of 69778321 is 12387796.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29582721 + 40195600 = 5439^2 + 6340^2 .

It is a cyclic number.

It is not a de Polignac number, because 69778321 - 2⁷ = 69778193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69778391) 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, 1203046 + ... + 1203103.

It is an arithmetic number, because the mean of its divisors is an integer number (18046125).

Almost surely, 2^69778321 is an apocalyptic number.

It is an amenable number.

69778321 is a deficient number, since it is larger than the sum of its proper divisors (2406179).

69778321 is a wasteful number, since it uses less digits than its factorization.

69778321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2406178.

The product of its digits is 127008, while the sum is 43.

The square root of 69778321 is about 8353.3419060876. The cubic root of 69778321 is about 411.6930211637.

The spelling of 69778321 in words is "sixty-nine million, seven hundred seventy-eight thousand, three hundred twenty-one".