78968421 has 24 divisors (see below), whose sum is σ = 134858880. Its totient is φ = 43567776.

The previous prime is 78968399. The next prime is 78968423. The reversal of 78968421 is 12486987.

It is not a de Polignac number, because 78968421 - 2¹³ = 78960229 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78968423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19785 + ... + 23438.

It is an arithmetic number, because the mean of its divisors is an integer number (5619120).

Almost surely, 2^78968421 is an apocalyptic number.

It is an amenable number.

78968421 is a deficient number, since it is larger than the sum of its proper divisors (55890459).

78968421 is a wasteful number, since it uses less digits than its factorization.

78968421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43265 (or 43262 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 78968421 is about 8886.4177822112. The cubic root of 78968421 is about 429.0268618973.

The spelling of 78968421 in words is "seventy-eight million, nine hundred sixty-eight thousand, four hundred twenty-one".