78722801 has 4 divisors (see below), whose sum is σ = 83353572. Its totient is φ = 74092032.

The previous prime is 78722773. The next prime is 78722821. The reversal of 78722801 is 10822787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10822787 = 2333 ⋅4639.

It can be written as a sum of positive squares in 2 ways, for example, as 36784225 + 41938576 = 6065^2 + 6476^2 .

It is a cyclic number.

It is not a de Polignac number, because 78722801 - 2⁶ = 78722737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78722821) 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, 2315360 + ... + 2315393.

It is an arithmetic number, because the mean of its divisors is an integer number (20838393).

Almost surely, 2^78722801 is an apocalyptic number.

It is an amenable number.

78722801 is a deficient number, since it is larger than the sum of its proper divisors (4630771).

78722801 is a wasteful number, since it uses less digits than its factorization.

78722801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4630770.

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 78722801 is about 8872.5870522638. The cubic root of 78722801 is about 428.5815909918.

The spelling of 78722801 in words is "seventy-eight million, seven hundred twenty-two thousand, eight hundred one".