78750013 has 4 divisors (see below), whose sum is σ = 81290368. Its totient is φ = 76209660.

The previous prime is 78750011. The next prime is 78750037. The reversal of 78750013 is 31005787.

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 78750013 - 2¹ = 78750011 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 2540323 = 78750013 / (7 + 8 + 7 + 5 + 0 + 0 + 1 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78750011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1270131 + ... + 1270192.

It is an arithmetic number, because the mean of its divisors is an integer number (20322592).

Almost surely, 2^78750013 is an apocalyptic number.

It is an amenable number.

78750013 is a deficient number, since it is larger than the sum of its proper divisors (2540355).

78750013 is a wasteful number, since it uses less digits than its factorization.

78750013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2540354.

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 78750013 is about 8874.1204071164. The cubic root of 78750013 is about 428.6309677017.

The spelling of 78750013 in words is "seventy-eight million, seven hundred fifty thousand, thirteen".