78002643 has 4 divisors (see below), whose sum is σ = 104003528. Its totient is φ = 52001760.

The previous prime is 78002641. The next prime is 78002671. The reversal of 78002643 is 34620087.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 78002643 - 2¹ = 78002641 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78002643.

It is not an unprimeable number, because it can be changed into a prime (78002641) 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, 13000438 + ... + 13000443.

It is an arithmetic number, because the mean of its divisors is an integer number (26000882).

Almost surely, 2^78002643 is an apocalyptic number.

78002643 is a deficient number, since it is larger than the sum of its proper divisors (26000885).

78002643 is a wasteful number, since it uses less digits than its factorization.

78002643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26000884.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 78002643 is about 8831.9104954704. The cubic root of 78002643 is about 427.2706940285.

The spelling of 78002643 in words is "seventy-eight million, two thousand, six hundred forty-three".