78958993 has 4 divisors (see below), whose sum is σ = 79443568. Its totient is φ = 78474420.

The previous prime is 78958973. The next prime is 78959009. The reversal of 78958993 is 39985987.

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 a cyclic number.

It is not a de Polignac number, because 78958993 - 2⁵ = 78958961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78958973) 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, 242043 + ... + 242368.

It is an arithmetic number, because the mean of its divisors is an integer number (19860892).

Almost surely, 2^78958993 is an apocalyptic number.

It is an amenable number.

78958993 is a deficient number, since it is larger than the sum of its proper divisors (484575).

78958993 is a wasteful number, since it uses less digits than its factorization.

78958993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484574.

The product of its digits is 4898880, while the sum is 58.

The square root of 78958993 is about 8885.8872939060. The cubic root of 78958993 is about 429.0097874508.

The spelling of 78958993 in words is "seventy-eight million, nine hundred fifty-eight thousand, nine hundred ninety-three".