78643922 has 24 divisors (see below), whose sum is σ = 139118076. Its totient is φ = 33239808.

The previous prime is 78643919. The next prime is 78643927. The reversal of 78643922 is 22934687.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 76930441 + 1713481 = 8771^2 + 1309^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 78643922.

It is not an unprimeable number, because it can be changed into a prime (78643927) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1658 + ... + 12650.

Almost surely, 2^78643922 is an apocalyptic number.

78643922 is a deficient number, since it is larger than the sum of its proper divisors (60474154).

78643922 is a wasteful number, since it uses less digits than its factorization.

78643922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11082 (or 11075 counting only the distinct ones).

The product of its digits is 145152, while the sum is 41.

The square root of 78643922 is about 8868.1408423637. The cubic root of 78643922 is about 428.4383991667.

The spelling of 78643922 in words is "seventy-eight million, six hundred forty-three thousand, nine hundred twenty-two".