78978073 has 8 divisors (see below), whose sum is σ = 84365928. Its totient is φ = 73672704.

The previous prime is 78978071. The next prime is 78978101. The reversal of 78978073 is 37087987.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10220809 + 68757264 = 3197^2 + 8292^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78978073 - 2¹ = 78978071 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78978071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18636 + ... + 22477.

It is an arithmetic number, because the mean of its divisors is an integer number (10545741).

Almost surely, 2^78978073 is an apocalyptic number.

It is an amenable number.

78978073 is a deficient number, since it is larger than the sum of its proper divisors (5387855).

78978073 is a wasteful number, since it uses less digits than its factorization.

78978073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41243.

The product of its (nonzero) digits is 592704, while the sum is 49.

The square root of 78978073 is about 8886.9608415926. The cubic root of 78978073 is about 429.0443406081.

The spelling of 78978073 in words is "seventy-eight million, nine hundred seventy-eight thousand, seventy-three".