78770401 has 4 divisors (see below), whose sum is σ = 83403972. Its totient is φ = 74136832.

The previous prime is 78770399. The next prime is 78770407. The reversal of 78770401 is 10407787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10407787 = 13 ⋅800599.

It can be written as a sum of positive squares in 2 ways, for example, as 49350625 + 29419776 = 7025^2 + 5424^2 .

It is a cyclic number.

It is not a de Polignac number, because 78770401 - 2¹ = 78770399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78770407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2316760 + ... + 2316793.

It is an arithmetic number, because the mean of its divisors is an integer number (20850993).

Almost surely, 2^78770401 is an apocalyptic number.

It is an amenable number.

78770401 is a deficient number, since it is larger than the sum of its proper divisors (4633571).

78770401 is a wasteful number, since it uses less digits than its factorization.

78770401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4633570.

The product of its (nonzero) digits is 10976, while the sum is 34.

The square root of 78770401 is about 8875.2690663438. The cubic root of 78770401 is about 428.6679546760.

The spelling of 78770401 in words is "seventy-eight million, seven hundred seventy thousand, four hundred one".