78002813 has 4 divisors (see below), whose sum is σ = 89146080. Its totient is φ = 66859548.

The previous prime is 78002797. The next prime is 78002831. The reversal of 78002813 is 31820087.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 78002813 - 2⁴ = 78002797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78002513) 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, 5571623 + ... + 5571636.

It is an arithmetic number, because the mean of its divisors is an integer number (22286520).

Almost surely, 2^78002813 is an apocalyptic number.

It is an amenable number.

78002813 is a deficient number, since it is larger than the sum of its proper divisors (11143267).

78002813 is a wasteful number, since it uses less digits than its factorization.

78002813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11143266.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 78002813 is about 8831.9201196569. The cubic root of 78002813 is about 427.2710044281.

The spelling of 78002813 in words is "seventy-eight million, two thousand, eight hundred thirteen".