78434001 has 10 divisors (see below), whose sum is σ = 117166962. Its totient is φ = 52289280.

The previous prime is 78433973. The next prime is 78434003. The reversal of 78434001 is 10043487.

It can be written as a sum of positive squares in only one way, i.e., 77792400 + 641601 = 8820^2 + 801^2 .

It is not a de Polignac number, because 78434001 - 2⁹ = 78433489 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (78434003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 484080 + ... + 484241.

Almost surely, 2^78434001 is an apocalyptic number.

It is an amenable number.

78434001 is a deficient number, since it is larger than the sum of its proper divisors (38732961).

78434001 is an equidigital number, since it uses as much as digits as its factorization.

78434001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968333 (or 968324 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 78434001 is about 8856.2972511090. The cubic root of 78434001 is about 428.0568551280.

Adding to 78434001 its reverse (10043487), we get a palindrome (88477488).

The spelling of 78434001 in words is "seventy-eight million, four hundred thirty-four thousand, one".