78311013 has 8 divisors (see below), whose sum is σ = 113906976. Its totient is φ = 47461200.

The previous prime is 78310963. The next prime is 78311033. The reversal of 78311013 is 31011387.

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

It is not a de Polignac number, because 78311013 - 2²¹ = 76213861 is a prime.

It is a super-2 number, since 2×78311013² = 12265229514172338, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78311033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1186498 + ... + 1186563.

It is an arithmetic number, because the mean of its divisors is an integer number (14238372).

Almost surely, 2^78311013 is an apocalyptic number.

It is an amenable number.

78311013 is a deficient number, since it is larger than the sum of its proper divisors (35595963).

78311013 is a wasteful number, since it uses less digits than its factorization.

78311013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2373075.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 78311013 is about 8849.3509931520. The cubic root of 78311013 is about 427.8330006905.

The spelling of 78311013 in words is "seventy-eight million, three hundred eleven thousand, thirteen".