78120993 has 8 divisors (see below), whose sum is σ = 106126848. Its totient is φ = 51097904.

The previous prime is 78120979. The next prime is 78120997. The reversal of 78120993 is 39902187.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78120993 - 2⁶ = 78120929 is a prime.

It is a super-2 number, since 2×78120993² = 12205779094612098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78120997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245505 + ... + 245822.

It is an arithmetic number, because the mean of its divisors is an integer number (13265856).

Almost surely, 2^78120993 is an apocalyptic number.

It is an amenable number.

78120993 is a deficient number, since it is larger than the sum of its proper divisors (28005855).

78120993 is a wasteful number, since it uses less digits than its factorization.

78120993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491383.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 78120993 is about 8838.6080917755. The cubic root of 78120993 is about 427.4866778790.

The spelling of 78120993 in words is "seventy-eight million, one hundred twenty thousand, nine hundred ninety-three".